That's the UBB's cache directory...
Disk space normally does vary in the cache directory... but a hundred megs in a day! Wow.
Clearing the cache will regain that disk space, HOWEVER it will build back up again relatively quickly.
You'd might as well make something of the cleared cache - upgrade to 6.1.0.4. The upgrade process will clear the cache for you, and you'll get the benefit of some fixed bugs. <img src="https://www.ubbcentral.com/boards/images/graemlins/smile.gif" alt="" />
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Charles Capps
Programmer, Infopop Corporation
Please do not contact me privately for support - post on the board or open a support ticket instead!