Powerbuilder beta : editor hangs when typing ²

I have activated autocomplete in PB 15 Classic.

When typing ² ( square symbol) as the first character of a line in the script editor, PB15 just hangs... No way to save anything, I have to kill the process.

As this key is just above the tab key on the keyboard, this mistyping is really annoying ...

I also noticed that CPU usage of PB150.exe goes to 25 % ( I use a quad-core PC)

Thanks