I can't offer much more help right now as I have not experienced PB freezing when pasting an image in. The difference between Snap Express and my old version of
SnagIt is that in SnagIt I have to save the image somewhere in Windows Explorer, then copy it, go over to PB and paste it in as an icon. Maybe you should try this and see if it still causes freezing. If it does, then it points to the image as being the problem, and the next step would be to see if this happens to all the image you paste in, or only those of a particular type or size. If it doesn't, then it points to the application you are using to paste it in, in this case Snap Express. It looks like a nice program but I have not found an English version of it. I can understand French, but would prefer to work in English. So if you know where I can find an English version, please post here and inform us. In the meantime, perhaps try a couple of other screen capture programs - there seem to be plenty around - but I think I'll stick to the one I know and use all the time. Hope this helps a bit.
PB 22.214.171.124 on Windows XP, J-1.6.0_17