about:tor fails with TBB using system-wide tor
Debian Wheezy 64-bit Tor version 0.2.3.25 (git-3fed5eb096d2d187) Tor Browser 3.0-beta-1-Linux Torbutton 1.6.4
When TorLauncher is disabled and Torbutton's custom proxy settings are set to my system-wide tor running on SOCKS port 9050 (or any other non-TorLauncher configuration), about:tor reports "Something Went Wrong! Tor is not working in this browser", although check.torproject.org works just fine.
Testing the proxy settings in the Torbutton preferences dialog results in: "Tor proxy test: No TorCheckResult id found (response not valid XHTML)"
This is a new defect. My configuration worked just fine with the last TBB 3.0-alpha.