This appears to be a bug in T3 v 1.2.7. The homepage (joomla default menu item) is not linked as “index.php” or just ‘/’ with no parameters. Instead it shows up as “/index.php?option=com_content&view=frontpage&Itemid=1” In previous versions of T3 the default menu item linked to “/” or “index.php”
I checked the T3 demo sites at Joomlart.com. At this moment (Sept 1, 2011) ja_social and ja_teline3_v2 are both still on T3 v1.2.5 (as reported by plugins/system/jat3.xml), and for both of those two demo sites, the home page menu links to the root ‘/’ as it should.
I checked all of the rest of the T3 demos and they all display this bug. I looked at the version number for most of them and the ones I checked all showed t3 v1.2.7
Ordinarily I could ignore this issue, but in my case I have a different component on the front page that requires a very long and complicated and ugly URL. I would love for that to go away.