i have the same issue. tried twice, hangs at different %.
win xp app, usb drive.
in my case, both the drive lights still kept flashing. everything inside hdclone window froze, no timer change, no button click reaction, no errors before that.
i still let it work through the night to see if it still does the trick, but in the morning, the target disk did not contain a partition.
maybe i'll try a bootable app.