Always experimental, I downloaded v1.0 IDE. But discovered that I'd need to modify sketches already debugged in order to be compatible with the new libraries. But to my suprise, v022 would no longer upload properly. I assumed the worst, got another arduino, but couldn't even re-install the boot loader on the first board. Then tried v1.0 upload again, and it still worked...
Then renamed the preferences.txt and tried v022 again. . .It worked this time.
Diff between the preferences.txt created by the two IDE's shows that "serial.debug_rate" changed from 9600 to 19200 in the v1.0 IDE. Plugging 19200 into the original preferences.txt fixed v022.
Hope this helps someone else.