PPro14CC - Playback freeze, audio keeps playing (OS X, iMac)

I think this is might be a similar issue to what others are experiencing, but the symptoms are unique so I'm hoping someone has found a possible solution by now?
One of our editors has been working on a large project (10 HD promo spots, at least 100GB of raw footage from Canon C300) and experiencing at least 4 crashes per day. And by "crash" I mean that CC14 stops playback -- the Program monitor freezes -- while the audio keeps playing. In some cases he can switch out to the Finder and then back to CC14 to stop the playback, and while he is able to hit "Save" and "Quit" the Program monitor never unfreezes. Some times though he gets the Beachball of Death and has to force quit everything, and curiously the timeline audio still plays out of the speakers after CC14 has quit and the machine is waiting to restart. On at least one occasion he got a major error and PPro created a new project file after closing down. VERY frustrating.
From what he's told me (I haven't been working alongside him that closely), the freeze ONLY happens when the playhead hits a clip that has filters or effects applied. Right now he's mostly doing a picture-in-picture effect with a beveled edge filter applied to the smaller window, and 3-way color correction on other clips.
For troubleshooting I focused on the graphics card first. The iMac has a Geforce 780 and was originally running with OpenCL so I downloaded the latest CUDA driver and switched to that but it made no difference. Turning OFF the hardware acceleration just made everything sluggish. I also repaired permissions on the drive. I'm hesitant to do anything too major while he's still working so please let me know if trashing prefs and/or reinstalling will wreck anything in the project or if you would recommend importing everything into a new one.
Brand new 27" iMac (non-Retina), 32GB ram, latest Yosemite (10.10) and CC14 versions, no plugins installed, no fancy system extensions or antivirus software. OWC Thunderbay RAID, M-Audio speakers, 2nd monitor is 42" Plasma TV via mini-Displayport-to-HMDI adapter in 2nd Thunderbolt port.
TIA, JVK

UPDATE:
We switched the Sequence Settings Preview to Quicktime>ProRes from I-frame MPEG, and it seems to be running better. Will update again if it fails to produce consistent results. Hope this helps somebody else!
JVK

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PPro14CC - Playback freeze, audio keeps playing (OS X, iMac)

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