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Thanks! I tried doing an "unquarantine" but that didn't fix the issues. I had to do a DCS repair. Everything seems to be working again.

Ok. Uninstalled malwarebytes still getting unusual behavior when starting dcs: null Investigating more. Maybe Windows defender?

Malwarebytes offered me a free 14 day trial. I installed it and apparently it is quarantining my F-15E. Malware.AI.4280553145, H:\Eagle Dynamics\DCS World OpenBeta\Mods\aircraft\F-15E\bin\ARF.dll Also looks like it is blocking the license validation for DCS. Assumed it's a false positive. But took me a couple of minutes to figure out what is going on.

Thanks Balzarog! I did as you recommended and that seems to have resolved the issue.

I just installed the latest update for DCS World OpenBeta and received a virus alert in Avira for the Mig-15bis module. Has anyone else had an issue with this? Is the virus software reporting a false positive?

Microsoft did the following updates on my system on July 1, 2016: Security Update for Adobe Flash Player for Windows 10 Version 1511 for x64-based Systems (KB3167685) Update for Windows 10 Version 1511 for x64-based Systems (KB3149135) Update for Windows 10 Version 1511 for x64-based Systems (KB3152599) After the update Mig-21Bis reported that the activation key was no longer valid because the computer had changed. Since the update is the only change that has occurred on my system that I am aware of I suspect it caused the issue. Has anyone had similar issues with the Microsoft updates and activations? I could try and reactivate but I would hate to have to lose one of my remaining activations; especially if this issue occurs whenever Microsoft does updates.