Beta 46 (but was happening for the last few builds too, noticed before 38 or so).
Configure Auto-import... -> Add.
Browse for a folder.
Return, still on the Folder settings dialog. Deselect some of the import file types, say Audio and Image, leave just Video; click OK.
Now I'm on the Media Import dialog window. The folder I just added is at the bottom of the list. I click "Edit" to verify that the file type selection I made (just Video) is correct.
It's not. The folder still has the default 3 values - Audio, Image, Video. I have to deselect Audio and Image one more time, OK it, now it sticks.
So I had to edit the entry a second time, the choice made while picking the folder was not retained.