I have had this problem since Friday, and it has wrecked my scheduling. There is an extra day being added to all durations when using the SF dependency. I have 1000's of cells now showing incorrect dates since this bug started at the end of last week. Finish-Finish (FF) also exhibits this problem, but Start-Start (SS) and Finish-Start (FS) seem to work properly.
I made a new sheet with a very simple layout to see if it reproduces the problem, and it does.. see attached pic. I am now going on 4 days without a response from support. I find it odd no other complaints are surfacing...