I am also seeing this as well with my own plugins that use the VST2 wrapper + SDK 3.6.7.
Ableton Live 9 does not see or list them, however Reaper and Bitwig do see them, and they work properly, and the GUI shows correctly.
XCode6
MacOS 10.9.5
SDK 3.6.7
Compiling as 64-bit
Ableton Live 9, Reaper 5.24, Bitwig 2.0, all x64
- Will