I gave my VM 2 cores and 2 GB of RAM, 128 MB of Video RAM, VT-x/AMD, Nested Paging, PAE/NX and 60 GB of HDD.
I tried starting K3b with Kosole, I got a complaint about Klocale, then a K3b crash error 5, after that KDE crashed with only the Kosole and net-applet visible. I tried to save the output of the kosole and then I was dropped to shell where I could not log in.
My MacbookPro had to be reset after that.