When using Connections Metrics with IE 11 you have to wait some minutes until the graphs will displayed in your browser. This behaviour occurs because of a compatibility problem with Cognos and Internet Explorer.
Cognos BI 10.2.2 itself supports IE 11 only in the compatibility mode which is not forced by the Connections Metrics App. This causes that the Cognos iFrame within the Connections Metrics App stops working as it should. On customer side I had waiting times up to ten minutes until the graphs loaded completely.
To fix this issue you only need to add some lines into http.conf on your IBM HTTP Server:
LoadModule headers_module modules/mod_headers.so <Location "/metrics"> Header set X-UA-Compatible "IE=9" <Location "/cognos"> Header set X-UA-Compatible "IE=7"
After this changes your Connections Metrics graphs should load within a few seconds. This fix also works for Community Metrics.
Please be aware of Problems with IE9 document mode in your Header or Footer customization.
Some more informations about IE document modes are listed here.
IBM created a Technote on this.