Multiple screens turning on and off (10.9.5)

Hi
Have some serious issues, that makes working with my new iMac impossible
System setup:
Two 47" TVs (Philips) connected thru Thunderbolt and adapters to HDMI
One of the TB-port also has the Apogee ThunderBridge, after that the TV
MacOS 10.9.5
With 10.9.4 it worked flawless, had 3 screens running as an extended desktop (not mirroring)
Now after the update today to 10.9.5:
- I can't use the 3rd screen anymore, only iMac and one TV
- these 2 screens, randomly turn on and off, sometimes they work for a couple of minutes, then turnin on and off several times within seconds
- sometimes the TV even shows noise and then comes back again
Sadly I haven't made a backup from 10.9.4. I never would have thought, that such a bug would be introduced. Lesson learened I guess, although I'm hoping somebody has a solution...
I feel totally screwed

Did some further trouble shooting.
Both TVs still work fine on my old MacPro with OS 10.6.8.
Tried also to connect just one of the TVs. One was working fine, within 30 minutes no turning on and off, but the second TV didn't work at all. The iMac was not able to recognize it.

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Message was edited by: EZ Jim

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Welcome to the Apple Community.

Multiple screens turning on and off (10.9.5)

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