HSFX 6.0.15 issues

[5./JG11 Otto]

Has 6.0.15 obsoleted many of the old missions and campaigns? Been flying campaigns from Mission4today up to 6.0.1 just fine, now with 6.0.15 there are all sorts of problems, like indestructible planes etc. Is there a section that deals with problems that have come up in missions since the new release. I will be keeping a copy of 6.0.1 on my machine if no solution is available.