I have a GTR2 installation strictly for LeMans 24 Hour races from 1967 to 2019. When I select the checkbox for 1967 in class selection and load the game, it includes another random year so that there is a mixed class (e.g. 1967 and 2017). When I go back to the class tab both the 1967 and 2017 checkboxes are illuminated green. When I click on the 2017 checkbox to disable that year, it does not turn off. Anyone have any ideas what might cause this? I have several installations of GTR2 (LeMans, ALMS, etc.) and have never encountered this problem before.