I had this problem when I tried to use 4.1 from Hong Kong. However then I went and downloaded the Cable And Wireless Version, and it fixed everything for me.
Here is the link for that:
https://www.blackberry.com/Downloads...81A90F89D99BCD
And here is the link on how to install it:
http://www.pinstack.com/blackberryfo...read.php?t=929
As for the themes not working, I had this same problem. I would download them and do a hard reset and they didn't work, SO I was messing around one day and I did this and they worked:
Options
Advanced Options
Applications
Then find the one that you are wanting to activate, example mine on the list was: Com_plazmic_theme_......
Click on that and then click "Edit permissions", then change everything to ALLOW, then do a hard reset, and all of them will be there.
Hope this helps.