Try deleting the user.config file from the users application directory and then try reloading squiggle.
Squiggle will re-create the configuration file for the user.
There may be a problem in the config file. Especially if you have loaded different versions of squiggle.
go into: C:\users\***Username***\appdata\local\overroot
Delete each of the Squiggle.exexxxxxxxx folders.
Then reload which ever version of squiggle. Preferably the most current.