Getting around this bug hasn't been as easy as Sony says; you know, to have only one library format on the unit at a time. Even though all my downloads are in PDF, the "protected page" error kept coming back up. I finally resorted to downloading each title to the unit one at a time and checking to make sure it would open. And so guess which one is the guilty culprit that crashes all my other books??? The Sony Ereader User Guide -- which is ALSO in PDF!
So, when is Sony going to fix this bug??????