After a new update of DCS, I always delete the folders ..\Saved Games\DCS.openbeta\fxo and ..\Saved Games\DCS.openbeta\metashaders2
No idea if it is really necessary but it seems to help. Dcs will rebuild those folders during start-up.
Therefore, after all that, I made a new mission on the Caucasus map and did not have a problem.
Always, when you report a problem (especially during start-up), include the ..\Saved Games\DCS.openbeta\Logs\dcs.log (NOT the .zip file please)