Why does 0.99.8 reject so many images?

Just run the same 30 RAW lights/darks through both 0.99.6 and 0.99.8.
The 0.99.6 only “skipped” one file whereas 0.99.8 skipped 24!!
Why would it do this when the images are obviously perfectly good to the previous version?

Please. Read this:

and
this

If you want something working almost everytime and keeping control on what you are doing. Don’t use the scripts

Thanks lock042, I’ll try manual processing and see how far I get - whole new learning curve for an old man!
Is there a tutorial either written or video by any chance? (being lazy here).