I have a pretty large collection of TV shows and episodes. While I can download series and season covers without any problems, the app just crashes with out-of-memory exception and f/c when I select "download episode covers".
It takes a few seconds where the app hangs - probably trying to load a list of all episodes - and then the f/c dialog appears.
I'm running XBMC 11.0 Eden Beta 3 and XBMC Remote v0.8.8-beta1 on my Galaxy Nexus with Android 4.0.2 (Stock).
My XBMC library currently has about 10.000 episodes in it.