Do you have 'Settings | Program Settings... | Editor Behaviour | Trim Trailing Spaces' enabled? Although I personally like to trim off trailing spaces, I've seen it cause behavior similar to what you describe (not exactly sure, though). You might give it a try.
-- Len Philpot <>< <http://forum.pspad.com/read.php?2,32955,32973> PSPad freeware editor http://www.pspad.com
