Muon Software Center only opens via Konsole?!

[Guest]

I'm running Kubuntu 13.10 and just recently have not been able to open Muon SC from the menu (but can use terminal to open). The last thing I installed was Mendeley (32-bit).

I'm quite new to Linux in general, but a quick learner; so whilst I'm happy for technical answers, they will have to be explained in 'simple terms'...

Thanks!