QUOTE (mbalensiefer @ Sep 27 2008, 07:48 PM)
Hi Lex.
I do not think this is a program error: I get it all the time, when my fingers move too fast.
Your first "click" needs to be Clone Stamp's initial "copy-from" location, and in which you must simultaneously hold down the "Alt" button (PC).
For further issues, delete your "CS3 Settings" folder under your Photoshop CS3 folder and re-start. The folder will re-build itself.
Michael
Maybe you get a different screen message on the PC. If I forget to get a source point for the clone stamp tool, I get something like "clone stamp tool needs source point", but the word "program error"... I don't think this ever came up.