On a Windows Server 2008 R2 development image, logging into Tridion set up for Windows Authentication moved IE to the background. I could get back to the CME by changing Windows.
- Version: 10.0.9200.16635
- Update Version: 10.0.7
The behavior differs from Chrome Version 28.0.1500.72 m or Firefox 22.0, which both keep focus after logging in.
The "fix" was simply setting browser settings according to the documentation as described in the community answer below, but I'd be interested in still keeping the pop-up without losing focus, so users can change their password in demos and training. Feel free to add other scenarios or details.