Try running the configuration program and switching to software or Direct Draw mode. Try shutting down all non-essential programs (maybe after re-booting) before starting Divinity. Someone else had a similar problem that went away after closing instant messengers, audio players etc. running in the background. Try the other scrying statues, if you haven't already, to see if it is a problem with all scrying, or just the lizard.
Troubleshooting and Manual Install Procedure 
