Adding in my custom filter location seemed to work, but I'm having a different problem that persists even in the standard installation of ABP on Firefox Mobile - it starts automatically using Fanboy's List, but...
- The filter list takes a long time to load, and sometimes it doesn't load at all. If I tap somewhere away from the filter list area, or the back button, the filter window attempts to load again.
- If I'm somehow able to pick a different filter list, back out of the extension options window, and go back, the selection returns to Fanboy's List.
I'll try the latest development build to see if it makes any difference.