Mosh, after some more investigation it's certainly looking like a problem with my computer now. I just tried to upload a file using vBulletin's standard attachment manager and found that I'm experiencing the same issue. This is both on my own forum and others. Anyway, I started up a virtual machine running Windows XP and found that the problem was gone when using it rather than Vista x64. Anyway, I'll look into the problem some more and make another post for the benefit of others if I find out what the problem is.
Cheers, Bryce.
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