Can not start application from mapped unc rive, suspecting caspol

We have some trouble starting some custom applications from a mapped UNC drive at some terminal servers, others not. The terminal servers are Windows 2003 servers. One such application was possible to start after executing the following command:

C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727>caspol.exe -m -addgroup 1.2 -url "file:///\\server\applicationshare\folder\*" FullTrust -n test

However, several other applications in the folder structure under the same path do not start. There is no error message, nothing logged in eventviewer, and nothing appears when running the exe file. Tried an process monitor trace, wich shows that the exe file executes, digs around in C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG, then searches in several registry keys such as HKCU\Software\Microsoft\Windows\CurrentVersion, goes through a bunch of dll's, reads through what looks to be the GAC and then issues a Process Exit with the following information:

Exit Status:      -532459699
User Time:      0.0156250 seconds
Kernel Time:      0.1406250 seconds
Private Bytes:      8 126 464
Peak Private Bytes:      8 318 976
Working Set:      8 863 744
Peak Working Set:      9 043 968

I have verified that C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config contains the settings I have  been trying to add, both with mapped UNC drive letter in the path and full clean UNC path.

I am unsure on how to troubleshoot further, any ideas?
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itniflAsked:
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itniflConnect With a Mentor Author Commented:
.Net 3.0 and .Net 3.5 were missing on the terminal servers where this problem occured. Installing this fixed  the problem.
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