I just fired up MFC-Edit to look at something and was prompted to load the new version (7.5), which I did. I then opened a sysx file and when I tried to change tabs to the "IA Switches" tab, it didn't seem to do anything so I tried another tab and that worked. I then tried to change to the "Base Config" tab and the same thing was happening. While I was sitting there trying to figure out what was going on, all of the sudden the Visual MFC mode started. I closed it (visual mode) and then noticed that it had changed to the Base Config tab. I changed to another tab and then another. When I changed to the IA Switches tab, again it lagged and then the Visual MFC mode started again. I closed it again and changed to another tab, all good. Changed to Base Config and visual mode fired up again. It appears that whenever I open either of those two tabs that Visual MFC launches. @bwanagary - is this a bug?