Black blocks showing on thin client displays

We have a problem with our thin clients showing black blocks all over their TS displays. It seems to happen at random. We have two Win 2003 TS servers, both the same, both causing users problems. Not all users are affected, just some.

These blocks tend to appear suddenly and then affect various parts of the screen.

I thought at first that the settings on their connection icons may be set to the wrong number of colours, and indeed the servers RDC settings were set to limit colours to 15bit. However removing this limit didnt help, and all the icons are set to use high colour.

This has just started recently, so I'm worried that it may be the start of a fault on the server.

Any ideas what may be causing it ?
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stonnewayAsked:
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Cláudio RodriguesFounder and CEOCommented:
What kind of thin clients do you have? Does it happen on a real Windows machine running the latest RDP client?
Are these thin clients running Linux?
Are you running the latest firmware on these thin clients?

Cláudio Rodrigues

Microsoft MVP
Windows Server - Terminal Services
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stonnewayAuthor Commented:
Wyse S90's. WE dont have any non-thin clients here to test. Mixture of latest RDP and the one before. Latest updates from wyse applied.
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Cláudio RodriguesFounder and CEOCommented:
Which OS these Wyse terminals run?
Are they up to date, running the latest FIRMWARE?
I would definitely get a laptop just to try a connection to your TS. If you see no issue with a Windows machine the problem is probably with Wyse. If that is indeed the case, you will have to contact them directly.


Cláudio Rodrigues

Microsoft MVP
Windows Server - Terminal Services
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ChiefITCommented:
Under this key are there a lot of values set to 0? (Zero means black)
HKEY_USERS\.DEFAULT\Control Panel\Colors from a working system
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ChiefITCommented:
I was meaning to say, you can take the keys values from a working system and edit the colors back to the defaults.

But, I hit submit.
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stonnewayAuthor Commented:
ChiefIT, do you mean on the TS server or the thin client itself ?
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ChiefITCommented:
I dont' know if you are experiencing the same problem as this guy. So, it might be best to look at this post. It's pretty interesting that a few people had this problem within a few days. Is something resetting these colors?

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_23136211.html

The fix will be on your terminal server.
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stonnewayAuthor Commented:
Alas that not it. The colours are all normal looking (ie not 0 0 0 but higher numbers)
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ChiefITCommented:
Thought for sure I had you covered on that one. Does your screen look like that, though? (Black username and password blocks?) Or is there some other sort of Black Block configuration?
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stonnewayAuthor Commented:
havent seen the logon screen like that. It's mainly toolbar icons, some times images in docs, highly graphical pdfs have sections blacked out, MSN messenger buttons sometimes.

Damned odd.

Frankly I dont know what to do. The fact that it's happen on all our TS boxes, on all our thin clients (on and off) even rules out a server reinstall.
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ChiefITCommented:
I am not out of Ammo, yet.

There is a free program called ShellExView: It will give you a list of shell extensions. Among those is Icon Handler.

I am thinking you may have a third party Icon Handler, picture handler, or font handler that may be corrupt for Terminal server applications. You may want to see if there is one that is producing the black blocks.

You can simply disable these third party handlers and it will resort to the Microsoft default handler by right clicking them and disabling them as a test. You can also double click them and get a popup information window you will see on the right hand side of my picture below. It will tell you what DLL's this handler runs off of.

Now, this is reaching for a solution, but may provide you with the ammo to get things to work right.
untitled.JPG
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stonnewayAuthor Commented:
No 3rd party icon handlers are listed. All of them are MS ones. I've disabled one for publisher which had a blank name, but that didnt help.
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stonnewayAuthor Commented:
An example of the black blocks
DSC00003.jpg
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ChiefITCommented:
After seeing that, I am out of ammo. I will poke around for you and see if I can find some answers.
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DenegarCommented:
We have experienced the same problem here from time to time, and the ONLY solution that has consistently worked is to update the firmware of our Wyse terminals. We have 3125s, 3150s, 3235s S30s and V30s. All models have experienced this issue at least once, and no setting I have ever changed on the terminal servers or thin clients has resulted in a lasting resolution to this issue, other than updating the firmware. If the latest firmware version available on the Wyse website does not resolve the issue, call their tech support, and if you are really nice they might give you the address to their private FTP site with the true latest firmware versions (their website is usually many versions behind what they actually have).

I hope this helps in some small way.

Jeremy Denegar
Manager of Information Technology
Township of Esquimalt
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stonnewayAuthor Commented:
We've spent SOOO many weeks talking to people about this and in the meantime have had another batch of S90's ordered, and most of those were affected as well. It would appear that S90's showing this problem have a manufacture date of the last few months of 2007 or the first few of 2008.

All the version numbers on all the S90's we have are the same, though not all are showing the issue so I think it has to be something to do with the chipset in recent models.
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ChiefITCommented:
In the configuration of the thin clients, can you turn off Bitmap caching on the client computers? Maybe this will make a difference.
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ChiefITCommented:
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stonnewayAuthor Commented:
Well. The solution has been found, but not the cause.

We were given a new image to apply to the units by Wyse, #528. Applying that fixed the issue and effectively rolled back the installed image to an older one. The only thing in common to each unit was the build time, between Oct last year or there abouts and now.

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seaniousCommented:
I would just like to add that ChiefIT had the right idea, if you don't want to update the firmware turning off Bitmap Caching solves the problem
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