Hi!
I found my first problem in DTPO. 
The day had to come.
What happens:
When I select a block of text in a RTF file it sometimes disappears, leaving the rest of the window in a “dirty” state. When this happens I save, close and reopen. The text is there again and I continue to work.
What the console has to say:
[NSCursor unsignedLongValue]: unrecognized selector sent to instance 0x18e0d5b0
(the same entry 2 to 6 times per incident)
My setup:
Mac OS X 10.5.1 (Intel)
DTPO 1.3.4
(no fancy stuff installed like input managers or application enhancer)
/Sven