[andreas_g]

It seems the problem is finally solved!

I did contact the OmniGroup support and told them all the details i was able to find out in the past month. They responded very quickly to my e-mail and found the solution on the first try!

It seems the crashes occurred due to a font problem. Like the support team told me, i did check my fonts using Font Book.app and found some duplicate fonts. I removed the duplicate fonts from my users's font directory (~/Library/Fonts) --> no more crashes!

Thanks to everyone for the great help and support!
It's again a pleasure using OmniWeb!