There used to be a list here of many the breakpoints, etc. that were not working. It has been a while since then, thus I do not remember. People would have to post them again to get a good list (there was even some good work arounds listed for some of the problems). The most obvious problem is that Softice does not stop at Winmain, even though it is configured correctly in Symbol Loader. Have tried all suggestions I could find, and all start up modes for softice, and nothing worked. I seem to remember MessageBoxW being a problem, where Softice would just ignore the breakpoint. Also, I remember that Backtracing didn't work (but someone had a workaround for it, that did work, can't remember what it was though). The other problem with the breakpoints was that it wasn't always straight forward which ones worked and which ones didn't work, as occasionally the breakpoint might work. Anyway, I don't remember the rest of them. BTW: When I tested them, I was using code that I wrote myself in Win32 Asm, and thus I knew for a fact what API calls I was using, and thus knew for sure that Softice was ignoring the breakpoints I set on those API calls. As I stated before, I did try all the different startup modes for Softice (plus troubleshooting modes), including having it startup at boot, and it didn't work for me, so I would guess that, if you had these same problems, and have it working now, that it was something else that you did to fix it (I wish I knew what that is). I believe that when I first tried using DS2.6, that I had a clean install of Win XP (has been a while now), but as it stands now, I have SP0, with many SP1 hotfixes installed from the Windows Update site, so that is probably just adding to the problems.