AE CC 188.8.131.52 on OSX 10.8.4. Monitoring with Decklink Mini.
Weird problem...whenever I minimize or click out of AE, all of the Output Device options disappear. For example, if I'm working in AE and then click over to Illustrator, when I come back to AE the only option available in Video Preview is Computer Monitor.
BM Drivers are up to date. Have trashed prefs and restarted numerous times. At a loss.
The DVCProHD QT Component trick appears to have worked.