From time to time objects get stuck in the OpsMgr console cache. Some symptoms of this would be old objects that were removed from OpsMgr still showing up in the console or new items in OpsMgr not showing up in the console.
To have the cache cleared for the OpsMgr console, modify the shortcut that starts it by adding /clearcache at the end of the target line like shown below. Now each time you start OpsMgr it will clear the cache.
Please note that the /Clearcache needs to be outside the target path.