These are my findings from trying out the suggestions. This was my first
upgrade so I read the documentation carefully and did a number of tests.
Since SP1 requires Hotfix 12785, and CFP15 is optional after SP1, I
tried the following combinations:HF12785 on its own: did not fix the
problem (as expected)SP1 (including HF12785): fixed the
problemSP1+CFP15: fixed the problemAll the answers above were helpful
but I have chosen aneeta45259594's detailed answer as the correct one.
Thank you!