Hi @dean-houston , Thanks for your response, at the end, we come to the same conclusion that something went wrong during the upgrade and some of the configuration blobs got deleted from the disk and also from the database table. Luckily, we have the backup, but we need to figure out which images are corrupted and need to be recovered. Gabor

Thanks for the detailed information, that's very interesting and a great assessment. We wouldn't have found this using all of these variables, especially the different Windows desktop version I suspect this might be a bug in the underlying libraries? We just use an HttpListener and a HttpWorkerRequest, both which should handle all of this, in the simplest way possible. I'll ask around and see if anyone knows. But I guess, at least you found a work-around which I'm glad to hear!