I seem to be loosing my content menu and context menus in all trees (no right mouse click).  I've tried debugging, deleting ClientDependency files. I did a new install seemded to work a while and then had the same issue.  Not really sure where to look, this is running locally I do have quite a few customisations but I believe this was working prior to going from 4.5 to 4.5.1.  I intially started seeing the problem with my ip changed but not sure if thats just coinsidence. permissions all seem fine. any ideas what to try?