Hi @bsinou
I’m happy to send you the config file. Can you please provide an email I can send it to? I don’t want to post it on a public forum.
I don’t think we have any nested datasources, it’s a very vanilla install for the most part. In my humble and non-expert opinion, I think the errors in the screenshots above indicate there was some kind of file upload error that caused the tree service to bug out. We likely have somewhat unique needs compared to your typical clients. Our file names tend to be super long and stupidly complicated, and the file sizes are frequently > 100Mb, sometimes > 1Gb. I’ve also seen staff upload literally 1000 pictures (.jpg, .png) instead of zipping them first. Our needs seem to be a pretty good stress test for each new version of Cells 
Regards,
Scott