I use Mozilla 1.0 RC2 on Linux without any real problems. It occasionally draws one scanline too few here or there resulting in slightly squashed-looking text, but that's rarely irritating and if so, scrolling or selecting cures it. It has nothing to do with any specific site either (occasionally it even happens to the "personal toolbar").

Besides this minor hiccup, it's a perfectly fine browser.

Makeshifts last the longest.