I've encounterd multiple problems with some of my websites.
This started to happen when since we upgraded our php version of our servers to 5.4
All the website are diffrent wordpres versions. (some lower then 3.5 and some higer then 3.5)
1. All slideshows are broken (they keep showing the loading icon)
2. Sidebar gallery wont show small thumnails (only shows numbers)
3. When making a message with a gallery you cant insert the gallery because the dropdown is broken (when you click on the dropdown it shows a loading icon. After like two seconds it disappears and afterthat its unclickble)
an alternative for problem number 3 is typing the short code however thats not user friendly, so i realy hope someone got a solution.
I've tried to find any solotions but so far without any succes.
It all started after the server was upgraded to 5.4