Thanks Sascha for your attempt at reproducing this.In 32 bit mode, when I double click on an audio region to open up the sample editor, Logic freezes up and quits. I've tried this on one song originally made in Logic 9 and one originally made from my old trusted template from Logic 8 (or earlier?). Same results.
Can't reproduce this. Doubleclicked audio regions open fine (and fast) in the sample editor. MB 2.4GHz, 10.6.2 here (32bit).
I found that after I went into 64 bit mode then back to 32 bit mode all is good as far as double clicking on audio regions goes. Strange temporary bug I guess. Love to explore 9.1 more but 2am is getting pretty sleepy here in tokyo. Sorry to cause alarm, but for those who might experience similar initial audio region clicking problems:
Change to 64 bit then back again to 32 bit. Worked for me!