Using Lr5 area of iMac screen goes dead to tools

Area of iMac screengoes dead to tools after using Lr5  every couple of days.  Can only be sorted by closing and restarting
Lr5.0  using with Late 2012 27"i7 iMac, OS X 10.8.4  Nividia GeForce GTX 675MX
After using the tools with Lr5 open for ~2 days, a rectangle of the screen (approx 17 x 10 cm, just off centre) goes dead to tools and I have to quit and reopen Lr5 to get access to the whole screen again.
When the screen area is dead to Lr5, other programmes work in that area, so not a hardware problem.
I've tried resetting Crop and about anything else I can think of bar trying the Lr5.2 Release candidate.

My first suggestion would be Reset the Preferences File
Next would be to reinstall LR.
Next would be to use the release candidate.
Actually I would recommend the LR 5.2RC first but you seem unwilling to do that yet.

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