The auto-generated URL for message board posts in Activities is currently using the message finder function which will load the message into a Message Board portlet if it is on the same page as an Activities portlet. This can cause problems if the on-page message board is configured differently (eg. different scope/different email notification options, etc.) from the site's default message board.
Easy fix would be to change the URL to a direct link to the post vs. a dynamic one.
Steps to Reproduce
- Create a New SO Site
- Post a message on the default Message Board
- Create a New Page
- Add Activities Portlet & Message Board Portlet
Clicking on the link to the message board post from the Activities feed loads the message into the message board portlet on the New Page.
Clicking on the link to the message board post from the Activities feed should take you to the Forums page and display the post there.