Detecting a MuiCycle event and its selected option

[Daedalus]

I can confirm that this is the problem - it used to work the way you had it (although that might have been just an accident), but in recent versions it needs a pointer to the string. I used the new command GetGlobalStrAddr instead to fix it:
[ab3]MUISet 10, #MUIA_String_Accept, GetGlobalStrAddr("0123456789")[/ab3]
But this needs the latest snapshot of AmiBlitz as the command has been added since the 3.6.1 release was put together. Otherwise, Der Wanderer's solution will work in older versions too.