Resolution: Cannot Reproduce
Tried to find in Jira a similar issue without luck.
Since a few weeks/month is the list of shelved projects empty.
Title, description and button to unshelve projects are present but there is no list.
Shelving projects works fine.
Unzipping and relocating the unzipped project to the job folder is the current work around but it would be nicer to do this again from the web interface