Cursor disappears (invisible) after exiting TDM

I've recently purchased a 0.5m thunderbolt cable to connect my Macbook pro to my 27" iMac. All is fine until I exit Target Display Mode (apple F2). At that point the cursor disappears. Very annoyingly, I can just about trace it's whereabouts via the various cues on web browser windows, and through trial and error navigate to the apple menu and restart, whereupon it's all back to normal.
Anyone know why this is or how I can prevent it from happening?
iMac running OSX 10.7.5
intel core i5
AMD Radeon HD 6770M 512mb

Hi Gregster,
If the cursor on your iMac is disappearing unexpectedly I would suggest that you troubleshoot using the steps in this article -
Mac OS X: How to troubleshoot a software issue
http://support.apple.com/kb/HT1199
Thanks for using Apple Support Communities.
Best,
Brett L

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