On my machine, the current setup was unable to find libpython2.7 through the fallback mechanism, since it was searching for a libpython*2.7, and didn't come up with a valid libdir.
I also noticed that dlopen was frequently failing for the C++ molfile plugins, which was caused by their being linked by the C compiler (usually gcc) instead of the C++ compiler.
On my machine, the current setup was unable to find libpython2.7 through the fallback mechanism, since it was searching for a libpython*2.7, and didn't come up with a valid libdir.
I also noticed that dlopen was frequently failing for the C++ molfile plugins, which was caused by their being linked by the C compiler (usually gcc) instead of the C++ compiler.