We released a small patch after v 1.7.1 named v 1.7.1.1 it fixes the initial crash issue some people reported. If you already run 1.7.1, you don't need to upgrade to this version, unless you experience initial crashes.
https://deeponion.org/community/threads/deeponion-qt-v1-7-1-1-security-fix-version-released.37329/