So, I decided to try something and duplicate the HIPS IPS Rules Policy in question, created a new name, exported/imported and now I'm able to see it within ePO 4.6. Maybe it was the amount of characters used on the policy name? It was 56 char long including spaces.
I had a very similar situation. I needed to import 5 HIPS IPS Rules policies from our enterprise server (4.5) to one of our standalone servers (4.5). The first 4 imported fine. The fifth appeared to import but would not show up. I tried several times to no avail; even tried renaming the exported .xls file. Then I tried Irock's method, i.e. duplicate, rename, export, then import. Worked fine!!!
Just an added note: The file that I had trouble with also had the longest name (57 characters). The renamed file had 34 characters. Just a coincidence? I don't know, but it worked for me.
Message was edited by: thurmanw1 on 10/1/13 9:53:41 AM EDT