3.5 bugs

I have a multisite installation, that after the 3.5 upgrade now no longer displays images in the front end or backend, including header images, thumbnails and background images. There are issues with trying to upload photos as well, this just doesn’t work.

I have been through every post, on and off ww.wp.xz.cn I could find regarding 3.5 bugs, and have tried each and every one in an attempt to resolve these issues, to no avail. Including turning off/deactivating all plugins, themes (except twenty eleven).

If I go to the media manager I can see the names of the images, but no thumbnails. the same in the front end of the sites, if I go to the gallery pages, there are names of the images, but no thumbnails.

Has anyone managed to find a fix for these issues yet?

I did consider rolling back the installation, I posted in another forum about downgrading or rolling back, it’s seems that it’s not 100% possible if you (like me) forgot to do a site backup before the upgrade.
🙁