Tunnelblick 3.7.5beta03 has been withdrawn from distribution and earlier versions will not update to it. It has a bug which can cause unpredictable behavior.
Tunnelblick 3.7.5beta04 will correct the bug and be available soon, possibly as early as Thursday December 7, but more likely on Friday, December 8. It will also include OpenSSL version 1.0.2n.
A fix for this bug has been committed to Tunnelblick's GitHub source code repository.