Oh, that's a shame. I googled UBB and Tapatalk, and found a comment on the UBB forum saying that Tapatalk were into being compatible, but we're just waiting for the release of v8. I didn't notice how old that post was, but it made v8 sound imminent.

I'll just have to put up with much squinting and pinching on my phone (first world problems, forsooth...)
_________________________
If it's brokenless, don't suffix it...