This is often the result of corruption in the Blizzard in Users/Shared. There are 2 folders in there, Blizzard & Blizzard Entertainment. Did you remove the "Blizzard" folder only? I just want to ensure that.
Also, make sure your OS X firewall is allowing SC2 as an exception. Alternatively, you can try disabling your firewall to see if this help. I would also recommend doing this for any security software as well.
Lastly, you may want to try a permissions repair, to ensure this isn't an issue due to bad permissions.Repair Permissions via Disk Utility
1. Navigate to /Applications/Utilities/ and open Disk Utility Resetting permissions on the Starcraft II folder
2. Select the hard drive the game is installed on
3. Select the First Aid option
4. Click on the Repair Disk Permissions button
1. Select the Starcraft II folder
2. Press Command + I
3. In the Info box, go to the Sharing & Permissions section and click on the lock and unlock it, entering your admin password when prompted.
4. Make sure you have Read & Write permissions
5. Click on the Burst icon (cog wheel) and select Apply to enclosed items
Then run a repair from the repair tool located in /Applications/Starcraft II/Support.
Let me know if this helps.
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