In this computer game I cannot move the king or rooks. It started as a Sicilian and for a while White's king and rooks were not in the opening that followed the book.

But then I discovered the game would not let me castle: Is there some modification

of the game, like an exercise to solve?

If you moved the king or both rooks, you can't castle, but you probably knew that. Not really sure what you're saying.

Probably just a glitch that will no doubt be fixed soon as they recently updated the CPU game.

i found a few glitches - its almost as if in certain positions, the computer isnt programmed to do anything at all. And i know its not mty comp as I re did all my moves and computer couldnt move AGAIN! It just goes to 'computer thinking'. So frustrating as its usually when you have it on the ropes!