Bah. It's still not cooperating. I have been having horrible luck with it lately -- it disappeared a bunch of games and I've tried reinstalling and force-closing and all manner of things and it just won't play nicely. I'll check again in the morning and see if it's decided to acknowledge your invite.

Have you tried Wordfeud? It's much more stable on droids and I've got about ten games going at any give time. NB: I am actually rubbish at Scrabble, but I fail happily.