Remote Desktop Display Quality issues : Unable to find the cause...

Dears,
I have a very strange issue that I never faced before but I'll give you the full story in order for you to fully understand the network/computer setup and the issue that is occuring.
The company WG has two sites which are connected through a permanent Fortinet VPN Tunnel which is working fine.
No Real Windows servers are used on any of the sites and the dhcp and dns are handled by the Fortinets
A small Synology serves as storage unit for the files and folders and a desktop computer serves as a CRM server (not safe I know ;-) )
The computers on one site are connecting on computers on the other side in order to get access tothe CRM using remote desktop connections
Everything is working well for 1 to 2 years till a month ago on a new computer (the computer of the boss of course, murphy's law is there to please us)
On this computer (a new Intel NUC with Win 8.1 Pro ), when you are launching a remote connection to the computer of the boss on the  other site (a Lenovo with Win 8.1 Pro), it connect perfectly but there is a "small" quality issue as you may notice in the attached pictures.
As you may see, it is not related to a specific application and it only appear on a remote connection, everything is ok on the computer locally
When you are making snapshot on the remote computer, the snapshot are clean without any strange thing
When you connect to the same remote computer from another computer on the same network than the affected system, you haven't the display issue
I Tried to change the connection and go from the Wireless connection to a cable connection, no change at all
I tried to change the color and display settings in the remote client, no change
I tried to install the latest firmware, bios and drivers on both computers, no change
I installed all the updates and the .net framework 3.5, no change
I tried to uninstall the graphic card, reboot and reinstall it, no change
I made a full reset of the network settings with the 4 netsh commands and still no change after reboot
I tried with another wireless card, no change
I tried with a single screen instead of the two present, no change
I tried reboot the destination computer, no change
I tried to use the remote connection manager instead of the remote client, no change
I'm at a loss and any idea is very welcome...

Thanks forwards,

Best regards
WG-Error.jpg
WG-Error-02.jpg
WG-Error-03.jpg
Laurent UlrichSenior IT Consultant Asked:
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akbConnect With a Mentor Commented:
When you open Remote Desktop Connection, Click on Show Options. Select the Experience tab. Manually choose your connection speed. Experiment with different options to see if you can improve the problem.
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Bryant SchaperConnect With a Mentor Commented:
looks like graphic artifacts, and I would suspect bandwidth. Can test afterhours with less user congestion?
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Laurent UlrichConnect With a Mentor Senior IT Consultant Author Commented:
Hi,
I think I found the issue based on the comment of akb :-)
The bitmap cache seemed to be corrupted...
I unchecked the box and tried again and the result was great :-)

To answer Bryant, I tried at different hours and no changes were seen but you were partly right because I think the bitmap cache was originally corrupted due to connection stability issues (bad channel and 2 different wireless networks at less than 30cm each on the same channel, I disabled one and changed the channel earlier yesterday)

Thanks for your help on this very strange issue.

Best regards
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akbCommented:
You're welcome. I almost said to uncheck the box but upon reading what it does didn't think that could be the problem. Glad you seem to have it sorted.
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Laurent UlrichSenior IT Consultant Author Commented:
The provided solutions were partial because the first one pointed only to the origin of the issue and the second one directed to the right section to fix the issue but didn't provide the complete recommendation regarding the settings to change
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