I noticed two small regressions related to the profile popup in the Forums tool.
1) The profile information should display on click, not hover (see
SAK-24780). Currently, when viewing a message, hovering over the image causes the profile popup to appear. This is due to new syntax in qtip2 (Forums was recently updated to use qtip2 in SAK-25606).
2) When you view a topic, you have the option to "Display Message Content" to show all of the messages in the topic with their message contents. It also displays the profile picture for the message author. But the popup no longer works on this screen.