Hey David.
I think the issue you had is a compound one.
The trouble is not 2.2, but that the version you are likely on is
older, and just has issues. (i think)
The reason is that Google recently unpublished all my apps as I was
too slow to accept the new TOS. I have complied now and my apps are
all republished.
So I think if you update the app via the market, you should be all
set.
The reason I rule out 2.2 is that I have run QueueMan on a EVO 4G and
Nexus, both running 2.2. But, if an update does not work for you,
please let me know your device as well.
Please follow up either way so I know if that did the trick.
-Eddie