With the latest upgrades to some browsers, you may find that you can no longer see content that is embedded in Blackboard courses or on other web pages that mix secure and non-secure content. This is a new web security feature, and if it is not currently in the browser you use, then it will very likely be there soon.
Academic Technologies has created a document that presents workarounds for Firefox, Internet Explorer, and Chrome browsers. These workarounds allow you to see the missing content in Blackboard courses, and the tips also work for other sites where similar issues occur (but remember, these safeguards were put in for your protection, so you need to be confident you are interacting with a safe site before disabling them).
For instructors: A way to avoid this issue in Blackboard is to have links set up so that they open the page they are linked to in a new browser window.