We have had a report back on someone with an unlocked but not rooted Nexus One 2.2.1 , build FRG83, running "Move it! Free" (Move It takes Android puzzles to the next level | Android Central) with apparently unreliable and sluggish touchscreen behaviour. We have seen no issues on the other 7 android phones we test with.

We would be very keen if anyone else out there has such a phone (or similar) than can report back if they see the same