"Because you changed your code and added a wantarray perhaps?"

No. curselection is a method of Tk::Listbox, not something written by the OP. Your guess is reasonable, but 5.8.4 Tk::Listbox document still claims that curselection return a list, just as 5.8.0 does.

By the way, the OP has to explain what he was trying to do with that piece of code, the code does look suspicious.

In reply to Re^4: Tk warning using curselection() with ActiveState 5.8.4 by pg
in thread Tk warning using curselection() with ActiveState 5.8.4 by Anonymous Monk

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