My site was running quite well with beta2, after upgrading to rc1 the calendar didn't display anymore, just looked like an empty folder no matter if i choose program or calendar view even after adding events.

I had to re-upload the pictures I had on the articles coz they weren't displaying.

Then I created a gallery and uploaded images and everything seemed ok during the upload process, but then the images are not displayed, only the name under the space where they were supposed to be, when i click view as slideshow the folder is empty...

I started a forum topic on this issue:
http://ez.no/developer/forum/install_configuration/ezpublish_4_0_rc1_events_calendar_not_showing_up/#msg218752

Steps to reproduce

Have a site running ezpublish4.0beta2 ezwebin 1.3 extension (still in construction) with forums, image gallery, event calendar contact form.

Copy the folder with ezpublish4.0rc1 to the folder in which the beta2 was running.