I think I know what your problem is/was - its FolderIcons combined with FolderEnhancer. Even if FolderIcons didn't have the update...
Did you have folders inside folders (thanks to FolderEnhancer)? And, did you theme those inner folders with FolderIcons? What I found out is that you can't do that. My iPhone went into a Safe Mode loop when I tried to do that. It would auto respring if I tried to change an inner folder icon (in Settings), then it would be in that loop. Or, it would respring if I tried to access a FoldIcon themed folder within another folder. So I uninstalled all the folder tweaks (FolderIcons and Folder Enhancer) and all was good. But, I wanted those tweaks!
Then, in my Google searching to find out what was up, I discovered that other people were having issues when those two apps were installed.
Bottom line: you can run both tweaks, but don't use FolderIcon to theme any of the folders you have inside folders. The only ones you can theme are the ones that are visible on the Springboard.
I felt confident enough in my research that I put FolderIcons on my iPad - and it's working fine. Again, and however, I only themed the outmost folders.
I think you will find that everything will be fine if you do as I did - only theme the outer folders with FolderIcons. Oh, and don't uninstall IconSupport. You need that tweak and I honestly think its not it.
Hope this helps. Please let us know how you get on.
Marilyn