2f1f1af created the issue

I've got a user on OSX 10.11 whose been using the free version CD for well over a year without issue. However, as of two days ago it's started hanging up after uploads to every single server we have, using FTP and SFTP. It generally hangs up for about 5-10 minutes before it can be used again, and, in some instances, it has to be force quit and relaunched. He was using v6.2, but I've tried updating him to 6.6, as well as the most recent beta, and have tried rolling him back, but it makes no difference. We've also tried trashing and recreating his bookmarks, which made no difference either. I've already tried deleting the preference files as well...again, no luck. Any help you can provide would be greatly appreciated. I'll add that I've got 9 other users accessing the same servers without issue, also using the free version.

Thanks!