I’ve resolved the issue. Took me a while but I found it. The funny thing was when my plugin was associated with the Engine source, it never showed these errors before and actually worked fine but it led all the way down to my ISaitekX52ProPlugin interface having a declared “ISaitekX52Pro.h” when I needed to remove that back during 4.3 but forgot to. I did it for all my other plugins but looks like it went under the radar. Aside from that, I am going to create another issue since I can’t seem to Launch anything but the level that is current (unless that’s by design), or at least can add other levels to cook to the process. I’ll check the documentation first before creating it to see if that’s mentioned but other than that, this issue is now resolved and thanks for taking the time to help out Jon. Much appreciated.