MacBook Pro 15" Late 2011 Problems with iMac 27" Late 2009 TDM

Hi,
I just got problems with my iMac 27" Late 2009 (Mini-DisplayPort) and my MacBook Pro 15" Late 2011 (Thunderbolt).
When I try to use my iMac as external monitor for my MacBook, there are massive glitches and graphical bugs on my second screen.
I bought a MDP-to-MDP wire from Belkin which works perfect on other computers.
I tried these things:
- Disconnected MagSafe from MacBook + unplugged all USB devices + switched graphics to discrete.
- Shut down all computers ... then booted MBP, iMac and triggered CMD+F2
- SMC, PRAM reset on both devices
The cable works, because:
17" MacBook Pro Late 2011 works perfectly on my iMac screen with my Belkin wire!
I connected my MacBook Pro 15" to a 27" Cinema Display and it works flawless.
After that I plugged it out and tested it again with my iMac screen -> suddenly it works.
Retriggering CMD+F2 or replugging breaks it again with massive bugs.
The MacBook Pro 17" is on 10.7.2, 15" is on 10.7.3, but I also tried to trigger dual screen in 10.7.0 setup with the same issue.
Maybe its a problem with the internal 6750M of my MacBook Pro 15"?
The 6770M of the 17" is working well.
Sample Video:
http://www.youtube.com/watch?v=W_pgc52syes
All updates/firmware updates of iMac and MacBook Pro are installed.
Any solutions?
Greets,
Kai

Since this is a user to user forum with no employees participation, your plea is a good a screaming into the wilderness. I suggest that you post your thoughts here:
https://www.apple.com/feedback/

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Anonymous UUID:       6F0DF84B-3D91-5C11-47E9-02E15CD93773
Fri Dec 19 21:11:51 2014
panic(cpu 0 caller 0xffffff80070dc43e): Kernel trap at 0xffffff8007036768, type 13=general protection, registers:
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0xffffff80e2cd9cd0 : 0xffffff80070dc43e
0xffffff80e2cd9ea0 : 0xffffff80070f3976
0xffffff80e2cd9ec0 : 0xffffff8007036768
0xffffff8108d4be90 : 0xffffff8007035d5c
0xffffff8108d4bed0 : 0xffffff80070168ab
0xffffff8108d4bef0 : 0xffffff800701e106
0xffffff8108d4bf70 : 0xffffff80070c9b9d
0xffffff8108d4bfb0 : 0xffffff80070f4196
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I have macbook pro of later 2009 n have snowleapord 10.6.8 so i can upgrade to mavericks but i have doubt tht in upgrading will my data gets corrupt or lost is it reply please ????

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I bought 2 in case one craps out on me...knock on wood. Good luck hope you find a solution.

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