https://bugs.winehq.org/show_bug.cgi?id=33719
--- Comment #6 from François Gouget fgouget@codeweavers.com --- When trying to reproduce this failure outside WineTest I found out that it was caused by cmd.exe:batch.
The cmd tests were running regedit to clean up the registry even though they had insufficient privileges to modify it in the first place. This caused regedit (or Windows?) to pop up a dialog asking whether to allow regedit to modify the registry, causing a timeout of the cmd.exe:batch test. When the timeout occurred the cmd.exe_test.exe process got killed by winetest.exe. This left the regedit process around though it did exit seemingly almost immediately. Still I think it's the dialog that was causing the comctl32:propsheet error.
I wonder if something should be done at the WineTest level to avoid this situation. A simple solution might be to wait a couple of seconds. A better one may be to kill the whole process tree in case of a timeout.
I sent a fix for cmd.exe:batch so comctl32:propsheet should not be bothered by it. On Windows 7 cmd.exe:batch seemed to cause comctl32 failures in header, listview, pager, progress and syslink} too which this fixed too. So I don't know if it still make sense to apply this patch to comctl32:propsheet. I guess it would make that test more robust but at the cost of added complexity and in theory the same patch should be added to all these other tests too.