How to Forcibly Remove Failed Tasks from ABR11

An Update:

After searching through the forum I found the following article:

24511: Acronis Backup & Recovery 11: Removing Incomplete Activities and Backup Plans with False Status on Acronis Management Server

After running the fix it does appear to have deleted the failed tasks, however when I look at Backup Plans and Tasks in AMS it still shows the failed tasks with an execution state of "Need interaction". If I look at the detail I can see that nothing is now running so why do these entries still persist in the view? It's very confusing. I'm thinking that if I wait they may eventually be removed from the list. Perhaps a server reboot will do the trick or perhaps I have to accept the fact that they will be there for ever and there's nothing I can do about it? I can live with them being erroneously listed as long as they don't prevent new tasks from running.

I also tried this solution - in my case after applying the "fix" the activities now show nothing at all. ever.

I've given up for this feature - i can live without it.

Another Update:

I kind of came to the conclusion that even a nuclear bomb targeted at the CPU core was unlikely to ever remove these failed tasks from the server. They sit there laughing at me every time I use the AMC. Then I had an idea. I cloned each backup plan that was responsible for creating the failed tasks, then I deleted the original plan and renamed the cloned plan back to its original name. Finally! My failed jobs disappeared from the console.

Hopefully this will mean that my backups can resume. I'll know by tomorrow - so another update then....

Another Update:

Partial success (of sorts). My backup plan of last night did run. This should have backed up 14 PCs. In actual fact only 8 machines were successfully backed up. However it's impossible to check the status of the failed tasks as the AMS appears to have no record to show that any backup task occured. So, I've managed to go from having failed tasks which I couldn't get rid of to now having no tasks at all (even though a backup plan was executed and partially successful).

Where do I go from here?