I'm seeing some problems on the Files tab and the Security tab. This is on the live server. Locally it's working well.

When I try to create a new files folder, it doesn't show up in the list. When I reload, two folders are added. Similar problems occcur when deleting a folder. Once created, uploads to the folder work properly.

The same problem happens on the Security tab.

I do sometimes get this error in the Firebug console:

parentField.observeMethod is not a function
anonymous()leftandm...260260329 (line 643)
anonymous()base.js?...260260326 (line 162)
behaveAs(div#Image.thumbnailstrip, function(), Object name=arg1, Object name=arg2, Object name=arg3, Object name=arg4, Object name=arg5, Object name=arg6)base.js?...260260326 (line 195)
anonymous()base.js?...260260326 (line 184)
anonymous(Object #Image=Object, Object name=parentNode, Object name=applyToParent)base.js?...260260326 (line 190)
anonymous(Object name=parentNode, Object name=applyToParent)base.js?...260260326 (line 188)
anonymous()base.js?...260260326 (line 188)
[Break on this error] if(this.className.match(/parent=([^ ]+)/...Change',this.ajaxGetFiles.bind(this));}\n

Also, the security overview looks a bit weird (see screenshot). The table header doesn't seems to have enough table cells.

This is Silverstripe 2.3.4