There was a critical bug in GSE that could have been exploited in unexpected ways. This was fixed in PostMacro firing when no Loop Limit Set · Issue #779 · TimothyLuke/GSE-Advanced-Macro-Compiler · GitHub In essence the stepfunction could be overloaded and prevent macros from firing properly. I normally don’t talk too much about bug fixes but how this could break how macros were running was significant.
It may affect some Shadow Priest Macros that wereusing PostMacro in very creative ways. This will be fixed in 2.6.39.