If you want to get the automatically loaded texturepack go to your server list>Click on Gtm>Click on Edit> Server resourcepack: Enabled.
The version you should use is the latest one that you can turn on by typing /rp if it automatically doesn't apply. And I'm pretty sure there isn't a bug specifically for the mac. Additionally, there is an edit button in your first post so there is no need to post 3 times.