The Blackbird Content Framework works best when using the latest version of IE on your workstation.
Meanwhile, CPS requires version 9 or greater to run. Unfortunately, the CPS application doesn’t seem to know that 11 is greater than 9.
As a result, you may see this message when starting CPS:
Unfortunately, this must be done on a per-user basis. At any rate, after updating this setting, all should be well.