Per the title: when I get the "not enough available space for the disc cache, please go to preferences" warning, I have the choice to turn off the warning overall or display it once per session. Since AE doesn't delete cached files, it's critical to empty the cache and it means going to preferences and manually clearing the cache. PLEASE consider adding an "empty cache now" button to the warning dialog. I've requested this in the past - it trips up new users and it adds a few steps for experienced users. It would be so simple and fast to just give us ONE BUTTON to do this when we're warned it's necessary. Not a critical bug fix, but it would be a nice streamlined feature that doesn't seem like you'd need to re-write a lot of code.
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