You're right lonkero. Upon a quick check of the manual, which I should have done to begin with, I learn that the refresh interval is 30 days by default. There is no documented way to reduce this interval however, nor is there a method for turning off caching other than flushing the cache each time the script runs with a "/f". That might be a wishlist item for the developers, but then again, as you mention the cache may not help us much on our 10/100MB switched network anyway.

I'm off to add /f to our login batch file. Thanks for the help everyone!!