The directory name is not valid - Windows Server 2008 R2

[EDN Admin]

<span style="font-family:Arial,sans-serif; line-height:normal I have a very strange error that appears every now-and-again, and would like to know if anyone else has experienced this.
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I have a program written in C# that uses a Zip component (ZipForge.Net) to make an archive from some text files. Before calling the zip process, I make sure the destination folder exists, and then call the zip component. Nearly always this works fine, but once
in a while to process stops working correctly, reporting The directory name is not valid. If I check the folder to see if it exists, it reports affirmative.
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Now comes the *really* weird part. If I run Internet Explorer, the process works fine again. Until I run IE or restart the users logged-in session, the program will *not* run!
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This is my scenario:
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-) The program is a .NET program using framework version 3.5 (all updates installed)
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-) The operating system is Windows 2008 Server R2 (x64) (all updates installed)
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Has anyone experienced anything like this? Any ideas?
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Thanks,
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Martin. <hr class="sig Been programming since 1982, still going

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