Hello, I was having the same issue with crashing on second mission load after upgrading to 2.7. I was using a few sounds mods located in C:\Users\(your name\Saved Games\DCS.openbeta. This does not appear to be the issue (at least for me). What I noticed after upgrading to 2.7 was this folder located in my install directory - C:\Program Files\Eagle Dynamics\DCS World OpenBeta\_backup.000. After deleting this folder (backup.000) I have been crash free and my sound mods work with no issues. Not sure why the upgrade created this folder but hope this helps!
Witz
