TS3 Overlay doesn't remember that hotkey is set

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Hi, I have a problem with the TS3 overlay plugin. Every time I start TS3 I'm asked to enter a hot key for the plug in. I have done so. But when close the dialogue and reopen it the hotkey field is empty again. When I enter the same button again it says the button is already used. And the key... TS3 Overlay doesn't remember that hotkey is set