Rotational Joint Problems

[Texas Drafter]

I am working in inventor 2014 and have an assembly that uses multiple rotational, cylindrical, sliding joints. the problem i keep having is one time my part will will move like it should at the joint and then the next time i try to move it the part wont move at all. i cant figure out why this keeps happening. any help is appreciated.

i also just noticed that when i set angular stops on the rotational joints the settings will stay for a while but after moving some other parts i go back to where i set the angular stops and the settings are cleared out.