I am following the instructions in HELP for adding a link to an existing post. Immediately after I click on the Add Link the href appears in the text as desired. The problem is it doesn't stay there after updating the page and using the View your page feature. All the link text is gone. That's all the info there is.
One clue might be that after turning blogroll on and then off, and updating the page more than once last night, I discovered Blogroll was still turned on fter 12:00 noon EDT Tuesday. I am certain I left the KB1ZMX.wordpress.com blog with the blogroll widget back to the list of unused widgets Monday night.
I realize due to network congestion updates sometimes take a few minutes to execute but it would appear some of mine were not executed at all, perhaps due to dropped packets or server load? At any rate, the add link feature as described above is does not seem to be working for my blog.