Password protected PDF in iBooks not displaying

I loaded a password protected PDF into my iTunes library and then synced it with iPad (4th gen iOS 6.1.3). I see the PDF in iBooks on the iPad and when I click on it, it prompts for the password. I input the password and PDF "opens" but it's just the blank grey screen showing page 1/1 (it's supposed to be a 79 page document). Any ideas? I took the password off the document and loaded that one into iTunes then my iPad and it displays just fine. I did this same sequence with a different document and with the password it didn't display and without the password it did display.

If there is an issue with iBooks, any way to sideload this into Adobe Reader, or somehow "Open in" Adobe Reader from iBooks?

Thanks

Dan