sunbird "unable to write to file"

I upgraded to 0.9 recently and now I'm unable to "Export Calendar" to any location, whether on the thumbdrive or on the hard-drive of the computer. I get an error message saying "unable to write to [file name].html"

Is this due to some new component of Sunbird? I really love the program, and the new behavior-tweaks, but for now I'll have to downgrade back to 0.8.

I look forward to any newer versions.