With emacs and emacs-X installed, when emacs is invoked, the window it pops up in is unusually wide, and typing and cursor movement cause strange scramblings of the text to occur. For whatever reason, this bug went away for me when I applied the netscape java fix mentioned in, for example, bug # 2495 (using chkfontpath).
Have not been able to reproduce the symptoms reported on any of several systems.
I just noticed bug #2295 --- I've got a Diamond Viper 550 (Riva TNT) on a PII/400. My probs are not limited to emacs. Netscape hangs (even with chkfontpath workaround). When running info in KDE's terminal emulator kvt, the terminal window accumulates random pixels of text-color where they should be background color. Problems do not occur with RH5.2 & XFree86-3.3.3.1 and KDE-1.1.1.
Seems to be a riva driver problem.
emacs garbage screens are related to the chkfontpath problem which support knows about. The other problems mentioned in this bug report are not related, and if they persist, should be filed under a fresh bug report.