If I try to upload a control, I get the following error:
An error occurred loading a configuration file: Failed to map the path '/'.
This hints at a configuration problem. Which makes sense, because I have merged Sitefinity with an existing application, by merging the configuration in the Sitefinity default web.config and the existing web.config. Not easy, or rather, easy to get wrong.
I think, by the same token, that it is hard to pinpoint the error, without being able to see the files.
However, one can but live in hope...
Many thanks for even thinking about it.