IMac (27-inch, Late 2013) with iMac (27-inch, Late 2012) in TDM issue

With the late-2013 iMac 27" (3.5 GHz, 32 GB RAM, 3 TB Fusion, Mavericks 10.9.4) as the primary and the late-2012 iMac 27" (3.4 GHz, 16 GB RAM, 3 TB Fusion, Yosemite Beta 10.10) in TDM, the screen on the target display blinks off and on (goes black and comes right back after a split second). It happens intermittently, regardless of which Thunderbolt port is used to connect the two computers. The other Thunderbolt port on the primary is used to connect two external FW800 drives via a Thunderbolt-to-FW800 adapter.
Through exhaustive testing, and in constant consultation with AppleCare senior advisors, I have seemingly ruled out all obvious potential hardware or software culprits:
An AVR is feeding both computers consistent power.
Each computer's RAM and video cards have been tested with TechTool Pro 7: everything passed.
The Thunderbolt cable has been replaced.
Reset the NVRAM and SMC on both computers (though with all the testing I've done since, it might not hurt to do this again).
Both computers have been running the latest version of OS X (the target display is currently running Yosemite Beta).
Made sure to enable TDM after the primary iMac has completed its full startup process.
Turned down the display brightness on both computers.
Trashed the com.apple.windowserver.plist file on the late-2013 iMac.
None of these steps have resolved the problem and I am having NO other issues with either computer. I'm stumped, as are the AppleCare senior advisors I've been working with. This issue has been present since I first connected these two computers this way. Design flaw not revealed in testing? Problem part not revealed in testing?
Anyone here seen anything like this or have any ideas of what else I can try? Help would be greatly appreciated!
Thanks,
Dana

Purchase a Windows PC?? Gasp, indeed! No, after months of software and hardware troubleshooting with an AppleCare senior advisor, and me refusing to believe my brand new 2013 iMac could have a hardware defect, I finally took my entire configuration (both iMacs, voltage regulator, back-UPS) in to my local Apple Store. They were able to replicate the issue, but then misdiagnosed the problem and replaced an internal display cable. Within minutes of reconnecting everything at home, the problem returned. So AppleCare sent an authorized service tech to my home to replace the logic board. That seems to have finally solved the problem. Inconveniently, the tech didn't have what he needed to flash the new logic board with my serial number right then, so I had to wait two weeks to get that done. It did finally get done though, and now all is well.
Good luck with your issue!

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