Saw this thread after posting the same issue on the Helmi WM6 bugs thread. Anyway, same problem here. I verified that text messaging was working fine before installing, installed and then could not send OR receive texts any more. Uninstall restores texting, but it sounds like I don't want to reinstall...
Bummer, because I can hardly live without this app. I may have to dust off my old AKU3.5 ROM until this is resolved...
Just posted a feeler over at Treocentral to see if anyone over there might be able to help...