Thanks for all the good suggestions. Now the SET STEP ON works fine again.

Solution: I deleted the FOXUSER.* files and cleaned up the project.



>>Any explanation ?
>>
>>I'm using VFP 6.0 SP3.
>>
>>Suddenly SET STEP ON courses an C000005 error when the program gets to this line in my code??
>
>I'd only use Nick's suggestion of deleting FOXUSER.DBF as a last resort, but that does work. Try just opening the debugger (without trying to debug code) and clear all your breakpoints. Works for me.