ok, i have just installed JA and the menu screen comes up and lets me choose between single player (SP) and Multiplayer (MP)...i choose MP and the game starts...plays perfect...no problems...but when i click on SP, the menu goes away...the computer acts like it's loading something...then...nothing...no hour glass, so splash screen..no resolution resizing...nothing...it's like i didn't click on anything...so i opened the menu back up...click on MP, menu goes away...and boom! multiplayer starts...
my graphic card is obviously not the problem and i am not receiving any error messages...someone, please help!
thanks!

I don't know if this will work but on Jedi Outcast there was a similar problem created through the menu. Try making a shortcut directly to the Single Player exe file and see if the problem still occurs. Please let us know if that works.