Thread:Project:Support desk/Special Pages page disappeared

I have customised my Wiki (v 1.19.2) by adding a number of extensions - I was checking everything was OK by viewing the Special:Version page after adding each extension - everything was fine - I returned to the main Wiki, again everything appears to be fine, but if I now select the Special Pages link I get a totally blank page, i.e. a complete failure to load any of the Wiki furniture - HELP, I have no idea where the problem is and I've not come across selective failure of the Wiki before - The Wiki is private, so I cannot post the URL

The following extensions have been added: CategoryTree; Cite; ConfirmEdit; DynamicFunctions; ExternalData; Gadgets; GetUserName; GoogleMaps; ImageMap; Nuke; ParserFunctions; RandomImage; Renameuser; ToggleDisplay2; UserMerge; UserRightsList; Vector; Widgets; WikiEditor