THIMC To Whim it Might Concern, or PICBUDDYS... In MPLAB V4.00 I am trying to get the "black trace line marking the current Program Counter, PC" to appear in the source window (?.C file) and the Listing window (?.LST). It does appear in the Program Memory Window, but I would like to Simulate / observe the cycle counts in the Lisitng file window. FRUSTRATED... What sequence sets the PC active in the C and LST windows? This used to automatically happen in V3.4... New to V4.00 and there are changes - don't have MPLAB 4.00 SIMULATE Book, and Help is lots of dead ends - When I have the Listing window open and then try to STEP a window pops up "Program Error" - No Debug Information Available in Project. Then I try Debug->Center Debug Location with no help, GROWL... Help Eric Borcherding