Do you use M sized icons? Do you have any scenario for reproduction?
I was using the medium icons, yes. I can't really specifically reproduce it on the fly. It just seems to happen after I install a handful of programs after setting up StartAllBack how I want (with medium icons enabled) and one time it happened when I manually made and copied a shortcut into the start menu folder. The shortcut was fine when I made it and then as soon as I moved it into the ProgramData start menu folder, it turned blank.
Using M icons puts more strain on icon cache, but it crumbs down by itself.
I'm not sure what "crumbs it down" means but I'll just avoid using medium icons going forward because it broke the IconCache 3 times within 24 hours of using StartAllBack.
I've prepared a version which should fix M sized icons mix up https://startisback.com/StartAllBack_setup.exe