I use myth on a pc with xp and a 128mb envidia graphic card and didn't see any problem
Maybe it's a compatible error of the graphic card, do you have the same problems with other games?
I used to have problems with graphics with my previous computer(which had the same graphic card but different processor (amd) and now I have a pentium and I solved it)
I have had this same problem on every pc I ever played myth on. I think it has to do with the device being lost and the font texture not being reuploaded to the card. I've found that typing characters [into the chat] that haven't been displayed before in that game causes myth to rengenerate the texture and fix the problem. Of course, this only works in multiplayer.
Sorry. It's out of character for us Mac users to laugh maniacally. We usually just brood, moan about Gates, and enjoy safer internet connections. Kinda forgot my place there...
Thanks for your answers. Melekor has the best comment: to fix the problem you have to somehow make a character appear that never appeared before. Every other trick (typing "pi" or pressing some F-keys) is just a means to that end. Anyway I hope this gets fixed in an upcoming build.
To add to this problem, do your in-game graphics turn ugly too? Alt-tabbing makes my text go away and things like trees and bushes, and sometimes units, turn into a big mess of lines similiar to a barcode.