I've had the exact same issue here as well. Phone support is does not work with this product and I've been in Chat "Hold" for 3 hours now. I've replaced the output module, checked and verified all permissions, cleared all preferences, with no avail.
I have not had any issue with uploading galleries for the past year, and now, all of a sudden, issues.
iMac 27", Yosemite, 16GB Mem, 800 GB space, no permissions issues as I've also tried to just save the gallery to my desktop and upload via ftp client, but Bridge says location does not exist, which, ha, it does, because its on the hard drive....