@Web
1) I've just tested on dev site and it works properly. You may exclude fineuploader script from JS, but I've tested with sigma &alpha & beta (from your image I think) and everything works fine. You will have to send me your URL so I can check it out.
2) Just tested on dev site and this is URL pattern:
https://webiste.com/item/renew/47/
Works perfectly.
3) Nice catch, updated and will be available in 4.2.1
I would recommend you (maybe it will help) reupload osclass files. It does not have any impact on data or your installation.
Please, if problems persist, let me know.