hi, I'v tried 4 times for cloning bug 848070 and 887884 following ur steps, but work for me on QE test server.
*** Bug 976109 has been marked as a duplicate of this bug. ***
I now know what is causing this. I have spoken to BMO, and we think that it should be fixed at the upstream level. Since we are having an office wide power shutdown this weekend, I probably won't be able to get a patch out until Monday.