I periodically notice that the pinch-to-zoom, using my magic trackpad, stops working after I've been browsing in Safari for a while. I've been (pleasantly) surprised at how useful I find PTZ, and I use it quite a lot to optimize the size of the text in my browsing window. I do find that quitting and then restarting Safari always restores the functionality. I'm just curious if a) other people have encountered this phenomenon; b) if I'm doing something wrong to cause it to happen; and c) if there is any way - short of quitting and restarting Safari - I can restore it during a browsing session. Thanks for any insight.