We are on 4.1 SP5 patch 1 and have the same issue but it is intermittent.
We are using IE 10 and IE 11.
One thing that seems to work for some is to do the following.
To do this, follow these steps:
1. Open Internet Explorer.
2. Click Tools, and then click Internet Options.
3. Click the Security tab.
4. Click Reset all zones to default level, and then click OK.
After you do this, test Internet Explorer to verify that it works correctly.