Been frustrated that I was having problems with Drupal's Choas Tools, Views, Update and Panels on YazikOpen. I kept getting "unepected page errors" Today I eventually found a solution online which worked for me.
- Went into file-manager on my webhost and moved (did not delete) the CTools module from the sites<all<modules folder.
- Disabled all contributed modules.
- Moved the CT tools module back to sites<all<modules folder.
- Views panels and update now works!
Very pleased about this as I can actually use the Views module now!