1.2.6: Continuous notification flood of "you modified (FILENAME)" for unchanged files

I’m seeing one or two notifications like this per day on Mac OS X Yosemite. I’ll get a “you removed file xxxx” notification, and then some time later another notification saying the same file has been added. This has been going on for several weeks.

Someone else is reporting the same issue on this thread: Insync occasionally removes and adds back a file. Is this a known bug or am I being hacked?