Muscles issue

hello everyone…

there’s a problem while i am using Maya muscles creator for creating muscles.when i sculpt the muscles using point selection in cross section curves Maya undo stops working.below are the process i am following:
after setting the desired rest,squash and stretch poses when i sculpt the muscles using point undo works for first time but when i switch to edit other curves and sculpt it using point selection Maya undo stops working.every times error comes as(//Error:line1:there are no more commands to undo)and i am not able to use undo command until i restart Maya .please let me know the solution for this i have tried it in Maya 2009 as well as in higher versions but still facing the same problem.

Sometimes the undo levels are attached to the tool you are using at the time. (I.E. if I start using the spline IK tool, the undos are now attached to the clicks I made while using the tool, and only go as far back as I started using the spline IK tool) If you switch back to the move tool, do you get your undos back?