Everything seems to be working ok except when I need to upload new plugins. During this process the IIS server is throwing an error 500 when loading the theme, as shown in the attachment. Everything else is loading fine, only this call for the theme is failing. From that moment the theme won't load at all on any page, until I restart IIS.
It's easy to reproduce: install a plugin, and loading the theme generate an error 500.
Could you help troubleshoot this error? I've check the user account ACLs etc and everything seems to be working fine.
Thank you! Ludo.