I am running SPSS V15. It worked fine under all situations until I had to relicence at the start of this year (I did this using codes provided by an administrator via the internet). When I am at work and connected to the network it is fine, but if I try to work from home/off-campus it says : 'this licence does not allow the program to continue' and 'processor is too busy'. I uninstalled and reinstalled version 15 and licensed it again but this has not solved the problem. The folk at work can't understand it: they say the licensing codes should cover stand-alone use. I am not totally convinced that this is happening consistently, but am a busy lady so I can't be 100% sure about that.
I recall this happening before (two years ago) and this exact problem only seemed to happen when my laptop was running on its battery rather than off the mains (that sounds really crazy but it was true: SPSS won't work, check the power switch!).