VNC Crashes upon Connection

I use Ultra VNC 1.1.02 to remotely administer my clients.  For a while now the application will crash within 10 seconds of making a connection to a system.  The event I get is below...

Event Type:      Error
Event Source:      Application Error
Event Category:      None
Event ID:      1000
Date:            4/6/2010
Time:            10:51:57 AM
User:            N/A
Computer:      PCTL72NZXH1
Faulting application vncviewer.exe, version, faulting module vncviewer.exe, version, fault address 0x0002fa74.

For more information, see Help and Support Center at
0000: 41 70 70 6c 69 63 61 74   Applicat
0008: 69 6f 6e 20 46 61 69 6c   ion Fail
0010: 75 72 65 20 20 76 6e 63   ure  vnc
0018: 76 69 65 77 65 72 2e 65   viewer.e
0020: 78 65 20 31 2e 31 2e 30   xe 1.1.0
0028: 2e 32 20 69 6e 20 76 6e   .2 in vn
0030: 63 76 69 65 77 65 72 2e   cviewer.
0038: 65 78 65 20 31 2e 31 2e   exe 1.1.
0040: 30 2e 32 20 61 74 20 6f   0.2 at o
0048: 66 66 73 65 74 20 30 30   ffset 00
0050: 30 32 66 61 37 34 0d 0a   02fa74..

A Microsoft Error Report pops up saying,

Vncviewer.exe has encountered a problem and needs to close.  We are sorry for the inconvenience,

I have tried to uninstall the app and clean the registry and the files, then reinstall the app with no luck.  I do not see any Events on the Client end.  I have doubled checked to ensure that we are using the proper .dsm and .key files for encryption and that we are running the same VNC version on both ends.  Has anyone else seen an issue like this and is there a fix for it.  
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mcsweenSr. Network AdministratorCommented:
John_KoehlerAuthor Commented:
I wish I could, but Division Security dictates what we use and this is their orders.  Unfortunately they have been no help in fixing this issue either.

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Your security division is tying your hands - it is impossible in the real world (non-policy writing security world) to effectively troubleshooting problems without the ability to derive cause and effect relationships, said relationships only afforded a tech through experimentation with settings and/or versions.

That being said, VNC is a very basic program that, in your case, is made more complicated through the use of encryption.  If possible, and in loosely abiding by the the security divisions wishes, I say try to vanilla-down the scenario by setting the endpoints to not have encryption picked, just as a test.

You have to peel this onion somehow.
John_KoehlerAuthor Commented:
No useable answers came in
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