Alright fellas, I got the 1.5 U boat add on and started playing FOTRS Mod. I notice that whenever I've been playing for long hours or when I sink a ship the game glitches out. It's hard to explain, but the text and skins get all funky, I can't read the words, and the sub turns funny colors. Is this an issue with the mod or just SH4 itself? I noticed that version 1.4 with mods used to do the same thing, but the stock version ran fine and never had these issues. Anyone have any ideas?

Could be a graphics card problem, could be a memory problem, could be an overheating problem. Could be anything.

Guessing from what you've said so far is pointless. If you post your system specs we might have a better chance of figuring it out.

Here are my specs. Intel Pentium D CPU 2.80Ghz/4GB RAM/Nvidia Galaxy GeForce 9500GT 1GB 128BIT DDR2 Graphics Card. Does that help? Somebody in another thread also said to drop Anti Aliasing down to its lowest level?