We recently started receiving this error on a 2012 R2 CU7 AOS while compiling our project in the AOT.
"Unlock semaphore default (0) without lock"
That message pops up three times in a popup window (not an Infolog or in the error list), then the compile continues.
Can't really find anything useful anywhere about this error in relation to AX.
Has anyone else seen this before?