PHPX 3.5.15 RC2 is ready for download & testing. ftp://ftp.phpx.org/phpx-3.5.15-upgrade.tar.gz
Please remember this is a release canidate. It has been tested and is pretty much ready to go, but there may be little bugs out there. Nothing major, but it is possible. There are some serious changes on the backend, the new editor being the most obvious one.

I have fixed the forum not displaying issue and installation issues.  If you are already running .15 only update the /includes directory and you will be fine.  Otherwise update per the norm.  Also, due to the SQL errors in the last release canidate, make sure your version is correctly showing .15.  Otherwise run the following code against your database:

 update `config` set `version` = '3.5.15';