I suddenly had that issue a few years back too, try backing up your UserData folder in the GTL directory and then deleting your profile in-game.
Make a new profile (same name) and after this you can copy/paste the backed up Settings folder (if you had any setups there) and your .plr file into the newly created profile and overwrite - however I do believe when I did this I then left the fields 'Online UserName' & 'Online Password' in the .plr (open/edit with Notepad) empty since your old lobby account will need to be deleted (again
![](https://www.altbierbude.de/components/com_fireboard/template/default/images/english/emoticons/grin.png)
) for you to re-register with the "new" profile.
Hopefully that works for you as it did for me.
![](https://www.altbierbude.de/components/com_fireboard/template/default/images/english/emoticons/smile.png)