PM version 4.5.1 Beta 2 (0510) on a Win XP system:
In this version, the cursor on the cropping tool is misbehaving. After you select the crop tool, the cursor doesn't change to the appropriate mode until you have clicked and dragged it on the image, and it stays in that mode until you click and drag again. So for example, the crop cursor doesn't show up until you actual start the cropping. The move tool doesn't show up until you actually click on the cropped portion and move it. And the resize handles don't show until you actually try to resize. But resizing is virtually impossible because of the weird cursor behavior. You are lucky to be able to grab a side or corner of th image.
Cropping with this version is essentially unusable.