3 years ago a company I'm working at have purchased and installed SLES 11 SP2 but never registered it. Now there's a need to use this system but I can see that Yast is not working (its windows are empty). I'd want Yast to be fixed and update the system before developers start to work on it, but my Linux knowledge is not enough and the subscription is outdated (and the company isn't going to renew it). Could you please help me in troubleshooting Yast and make it work?