[Krynus]

I'm replaying PS:T for the first time in a number of years, and I have a pretty up-to-date computer nowadays (P4 2.6GHz CPU, 1.25 GB RAM, GeForce 7800GT video card). The game is mostly running smoothly, except I've noticed two things:
1) Occasionally, the circles around characters (and around NPCs/monsters/etc.) disappear (this bug is not *horrible*).
2) A good number of spells cause the screen to go haywire, showing pixelated 'white noise' rather than the spell effect (this is the best I can think of to describe it :S) and making the character portraits/parts of the HUD turn black.

I've tried using software video settings, but they just made the game run really slowly. I've tried running the game under Win98, WinNT and Win2K compatibility modes to no effect.

Has anyone else experienced these problems? Can anyone give me a suggestions as to how to fix it?