I think I am encountering some sort of bug in the Dagobah Level of The Complete Saga. I understand Luke can't use the force without Yoda, but even with Yoda on Luke's back I can't seem to use the force on anything which prevents me from progressing. Has anyone else encountered this issue?

Update:
This is pretty embarrassing, but I think I managed to find the solution to my own problem, it seems like for some reason my controller ceased to function properly as I also couldn't use the force on any level. Works fine now that I'm using my keyboard.