Safari will not open link from email

Question

When trying to open a link from an email in Postbox (3.0.11) Safari 8 (OS X 10.10) will open a new tab, but nothing else happens. The new tab remains blank and the address bar is blank. This occurs when Safari is set as the default browser.
When I set Chrome as my default browser, Chrome will open the same link without any issues.
Any ideas or is this an undocumented feature for the new Safari.
Homer
System: iMac 7,1 (late 2007)
OS X 10.10
Safari 8.0
Postbox 3.0.11

Answer 1

Uninstall SIMBL as follows. Back up all data before making any changes.
Triple-click anywhere in the line below on this page to select it, then copy the text to the Clipboard by pressing the key combination command-C:
/Library
In the Finder, select
          Go ▹ Go to Folder...
from the menu bar, paste into the box that opens by pressing command-V, then press return. A folder will open. From that folder, delete the items listed below (some may be absent.) You may be prompted for your administrator login password.
          Application Support/SIMBL
          InputManagers/SIMBL
          LaunchAgents/net.culater.SIMBL.Agent.plist
          LaunchAgents/net.infinite-labs.SIMBLEnablerForSandboxedApps.plist
          ScriptingAdditions/SIMBL.osax
Log out and log back in.
Make sure you never reinstall SIMBL. It’s likely to come bundled with another third-party system modfication that depends on it. If you want trouble-free computing, avoid software that makes miraculous changes to other software, especially built-in applications. The only real exception to that rule is Safari extensions, which are mostly safe, and are easy to get rid of when they don’t work. SIMBL and its dependents are not Safari extensions.