I don't think so.Glad your up and running again. I'm still having the same issue. Did you do anything different at all?
Have been trying to figure out a reason causing this problem and I finally tracked it down to these two windows updates:
Update for Windows 8.1 for x64-based Systems (KB2962409)
Update for Windows 8.1 for x64-based Systems (KB2955164)
Which are the update rollups for May and June... so yeah it's propably caused by the DX9 changes. The recent OBS update just didn't help.
Having either one installed caused the problem to occure.
So I'm going to continue without these updates for now but my worries are that the July update will break it again.