That would make sense then, because the ^ is used in an expression.
Ex:
dim(a$, 10);
a$[0] = "ABC";
a$[1] = "DEF";
ShowMessage(^a$[0]+","+^a$[1]);
The + "," is why it is crashing. Because you can do:
ShowMessage(^a$[0]+2); // display "C".
I guess then just an str() is safer:
ShowMessage(str(a$[0])+","+str(a$[1]));
Regards,
Kornalius