[Plugin: WP Super Cache] upload insert buttons not working

I’ve run into a bit of an issue with supercache, or, for that matter, any plug in cache. when enabled, they all seem to work fine. Trouble is, the upload /insert button array on my MCE doesn’t seem to be working. This is true regardless of the type of cache plug and in use. Based on performance, I would prefer to use Supercache… but I do need that editor working.

Can anyone give me a clue as to what it is I’m missing, here?