Hi Ben,
Sorry been busy on cases. They are paid for so get priority....
So if you can't export a simple report to PDF this has got to be something in your environment.
Do you have Adobe Reader installed? Although that should not make any difference.
Export to Word, Word has an Adobe plug-in that allows you to export to PDF also. See if that works.
Not the same code base but might help debug the issue...
Try doing a repair install of CR and check the export options, make sure Adobe is checked on.
Be sure to install under local PC admin account so the installer has full rights to register COM dll's and update the registry...
Check your AV and firewall logs, could be they are blocking or have blocked something to cause this problem.
Don