I recently installed 1.7.24 Alpha and I've been getting an intermittent message saying "REGISTRATION - The installation has become corrupted. Please repair or reinstall Recorded TV HD" when switching between the MC7 Guide and RTH.
Was this on your HTPC or Xbox? I haven't used my Xbox much at all lately. I haven't ever seen this error. I've added some code to help debug the problem and will release a new alpha soon to see if it will either fix it or to narrow down what is happening.