According to my reseller host - my recent technical problems with WebMail are the result of cPanel no longer supporting the "tree" theme. Comments?

I'd get in contact with cPanel directly, after contacting your hosting provider, and see if they can support your issue or not. I've never heard of anything that would cause this. Most likely its just a glitch/bug with cPanel that you are experiencing and could be fixed quickly.

Most likely its just a glitch/bug with cPanel that you are experiencing and could be fixed quickly.

Thanks for the response. Quickly being the operative there? It took two days, and most of the grunt work I did myself. I've googled around and find no references to cPanel stopping support for a theme.