After updating to version 2.7 (macOS Sierra), source tree can't push anymore.
Pushing to ssh://git@git.abc.com/abc.git
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
I can push though from the command line after entering my passphrase. I can fetch and pull with no problem from source tree.