Originally Posted by ixtab
Just for completeness: every key causes that "problem".
Well actually, it's not a problem at all, but a "feature" of dev keys. When you unregister your kindle, the entire developer keystore is deleted, because (according to Amazon's logic) you as a person are not entitled to test-drive any applications anymore. (And this is exactly the reason why JBPatch includes that "auto-install" feature)
@PoP: what do you think about a big fat notice in the first post, stating that everybody should use the test key, instead of re-inventing their own? This will keep problems for everybody to a minimum.
We need a new sticky thread with kindle custom development guidelines, which include the "no new dev keys" rule that until then is inadequately unwritten. It needs to be adequately written and prominently posted in plain view (i.e. a sticky thread). IMHO.