For some reason, I cannot get custom themes to show up in my themes list.
-I am creating the themes using the latest Plazmic theme builder v2.0.0.26
-My 8830 is v4.2.2.66 and my 8830 simulator is v4.2.2.66 as well
-After I install the .alx theme via the application loader, it doesn't appear in the themes list
-The theme does show up in my application list, so I know it is at least transfering correctly
-Just for kicks, I have also tried installing the plazmic theme reader app (even though 4.2 shouldn't need it)
Are you doing it from your BB or from a comp? What I do I created a folder that I put everything Blackberry in. Then once I am done creating a theme I export it in axl format to the folder I made. then when I run the device manager I find the folder and add it to the manager and it seems to load right into my themes folder. I'm not sure this is what you are doing but this worked for me. Sorry if it doesn't help