view client 1.7 on lion 10.8.2 graphic problems

I'm running view client 1.7 on my macbook pro with lion 10.8.2 and have run into 2 different issues.  The 1st concerns graphics.  If I leave the view client running, close the lid of the mac and come back some time later, the graphics have completely haywire... picture fractals.  All menu funtions or F keys don't work and the only recourse I've found is to reboot the mac.

2nd issue... I've found that sometimes after logging into view client, exiting and then logging back in, the view client freezes whereupon the entire mac freezes with, again, the only recourse being to reboot the mac.

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