When i defend Whiterun and enought enemies got killed, the quests ends and then the next quest starts. Unfortunately it does not become the quest that starts normally but a quest names [...] I reloaded older saves and played until then, to no avail. So please...

HELP!!!

You must start a new game if you want to see that solved...

That's a bug introduced after you patch/update your game and continue to play with save games from previous game versions.

Try "setstage CWObj 1" in the console, minus quotes.

Thank you, after trying to fix it one last time, i will do just that. There the Quality Team failed again. Well who is to blame. Such a big chunk of software.

Thank you. I will do that and report back later.