I.E.11 isn't officially supported in ITMS 7.5 release, therefore there could appear issue due incompatibility, while managing SMP 7.5 Console.
Many people have Windows 8/8.1 OS and there is I.E. 11 which (as far as I know) cannot be downgraded to lower version of I.E.
Temporary solution while next release of ITMS 7.5 where I.E. 11 will be supported:
1. Install "Chrome" browser on your WIndows 8/8.1 OS http://www.google.com/chrome/
2. Install "I.E. tab" for Chrome http://www.ietab.net/
3. Open "Chrome" browser ⇒ click on "I.E. tab"⇒ specify URL of your SMP Server