I am getting the same error and it's not a bad install. Was working fine for a week and then it started happening out of nowhere causing me to re-install PB 12.6. This is not the only issue currently happening, be careful if using edit mask functionality in datawindows as it will round numbers and also enter weird characters in some string fields.
Our customers are not happy at all with this which might force us to revert back to PB 12.5.
