Not only that, but Processing can't open the local documentation files for "Find in Reference", and it can't manage tools and library updates properly (lots of "Can't delete file" errors as it tries to install or update).
Seems like a common thread of something stopping it from accessing external files or folders. However I've poked at Java control panel settings, reinstalled the JRE, reinstalled Processing (both 32-bit and 64-bit) and nothing's helping.
I'm currently downloading source on the off chance that I can find out more by running it in Eclipse (!!) but frankly this seems like a Java environment problem. Except I have no idea where to look anymore.
Anyone have any ideas where I should look to fix this?