In containers, Internet Explorer 9 cursor focus jumps from login prompt to address bar when typing in.
This is a product bug recognized as PCWIN-19869.
The issue will be fixed in future PVC updates.
The following workaround can be used to cure it until the official fix is released :
In Internet Explorer, go to
Tools > Internet options > Security > Internet and uncheck the "Enable Protective mode".
In case of Active Directory environment, a GPO can be created to disable "Protective mode" for all containers.