Product:
Cognos Analytics 11.0.7
Microsoft Windows 2012 R2 Server

Issue:
On new Windows 7 computer you get a blank screen when you surf to Cognos Connection.

Error message in left corner of browser:
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3)

Message: ‘performance’ is undefined
Line: 42
Char: 3
Code: 0
URI: https://caservername/ibmcognos/bi/

Solution:
Install a different browser like Internet Explorer 11.

For any issues in CA11, please first check with a different browser like Chrome. Many issues is only in a specific version of Web Browser.

Cognos Analytics only supports IE11 and some other browsers.
https://www.ibm.com/software/reports/compatibility/clarity-reports/report/html/softwareReqsForProduct?deliverableId=A6C8D9F0FF5611E6A4D1A0107E2821F7&osPlatform=Windows#sw-13

To install IE11 you need SP1 for Windows 7 https://www.microsoft.com/en-us/download/details.aspx?id=5842 and this updates
https://support.microsoft.com/en-us/help/2847882/prerequisite-updates-for-internet-explorer-11

Press F12 and select network, to troubleshoot more inside IE.