I was recently told by Mia Linden, responding to an Online help request I sent, that it was a good idea eo set your Preferences to "clear cache" every time you login so that you start the next session wth a clean cache.
Given that, why not make the "clear cache" box in preferences "sticky" so that you can always start with a clean cache (if you so choose) instead of having to manually check it every session? Or, if "sticky for all" is not agreable, at least add a "Do it every login ?" option.
Lach