Hi. I have a problem in MPLAB V4.0, only with PIC 16C505. Simulator mode, runing on PIC16C505. When I use the asynchronous stimulus window popup and click on "make project"(to complile the assembler) on the end of compile work, after result window, if I click on any window the program lock. CTRL+Alt+Del, close the program, but if I try open it, once again, an error mensage appear . It's necessary reset all PC if I 'll want running once again with asynchronous stimulus. This problem was verified on two PC, one under WINDOWS 98 and another running Win 95 OSR2. The problem is the same. Roberto ******************************** Roberto Guimaraes e-mail rodelta@wnet.com.br ********************************