I am spending the first clear night in a while trying a mini Messier Marathon with my 460EX and the Infinity software and discovered a bug.
Infinity crashed on 'updating' an image when I had 'Use Fast Display' on. I am using the latest version of Infinity.
I uninstalled it, installed an earlier version (4.2.0.7) that I had on my disk (SUGGESTION: leave the earlier versions accessible from the web site, so people can roll back if a new bug bugs them), replicated the problem (before realizing what it was), remembered I had checked 'Use Fast Display), unchecked it and everything was fine and then re-installed the latest version). Everything is fine now.
So: time to bug check the code for using fast display.