I had my question all typed up and then it disappeared. Anyway, what causes this glitch while using the healing brush (15px)?
cs4, mac mini quad core, 4gb ram, 462mb 8 bit file. I had dedicated 2gb ram to photoshop and upped it to the max allowed (3gb) to see if that helped but no luck. The video shows what's happening. The image also jumps around a bit and this is making my eyes sore. It occurs with almost every click of the mouse, but not all. My last machine was running photoshop CS with 1 gb ram and I would get the clock but no glitches on larger files like this. I know I need more ram but.....$$ is low right now.
about half-way through:
Now, minutes later back at the same file, it's glitch free for a few minutes.