I realize I am necroing a super old post, but after an hour of Googling, I finally found this thread and fixed the issue I was having for other using Dolby. Exception can be added by going to;
Tools > Options > Overlays > Edit the Program Exceptions list... > Add... > (navigate to OBS.exe) > Uncheck "Use overlays" (default).
Solved my problem to about 99%. Only hiccup is you still get the error popup that you have to abort, retry or ignore..