To temporarily fix the problem please set the CONTROLLER hotkey for "Grade Multiplier" to "NONE"
That fixed it, thanks!
edit: Well, it fixed the unhandled exception error anyways. Seems its not saving the changed hotkeys even with that option checked, so oh well.
edit2: err, im a derp. completely missed the "save" button on the settings page.
[Edited by Aroth_Khashar, 2/1/2017 2:12:59 PM]