Installing phpBB 3.0.x SVN r8787 under localhost, the installer incorrectly assumes the cache, files and store directories are not writable even though the directories user and group as well as the apache user and group are identical.

Example:
Apache User/Group: highway/highway
phpBB Files User/Group: highway/highway
Even though they are not CHMOD to 777, because they are the same user and group, they are writable.