If you are having the software manager close on you after 3 seconds or so try this:-
Go into application launcher and search for Nepomuk Fille Indexing Controller and just click on it. Then go back into software manager and you should find it will open. I have tried this and it works using mint 12 KDE. Hope this helps someone out
Thanks also to Coyote who helped out with this on the Quassel IRC client for mint 12
Am having this problem... i.e. Software Manager closing after about 3 seconds. Followed your suggestion (Applications>/System>Nepomuk Fille Indexing Controller) but no joy. This could be a deal-breaker... need a software manager, no?
I came to a solution by accident . I had a problem with banshee under kde. So someone suggested to change the oxygen gtk theme (settings>application appearance) with something else. That also fixed the software manager problem