This is for information so other people don't mess up the way I did.
I was having several problems and crashes with my SW2015 sp1.1
In my attempts to fix these I tried setting my SLDWORKS.exe and sldworks_fs.exe files to run as Administrator and in Compatibility mode to see if these would help.
My system is running Windows 7 and I also set the compatibility mode for Windows 7 as well (shouldn't do anything - but I decided to try it).
I didn't see any changes and tried several other fixes and forgot to return these to regular modes.
Among the problems I was having was very slow loading of Solidworks.exe (near a minute just to load the application) and sldworks_fs.exe seemed to have no effect if it was loaded or not.
I have also done many other things (repair SW, Uninstall and reload completely, clean the registry...) before and after setting the compatibility mode.
Then last night i realized I was still in these modes and turned them off.
Then I restarted and now I get 7 second Solidworks.exe loading.
Don't know it I still have some of the other problems but at least I got back my load speed.