Since the latest upgrade, images inserted lost their link so cannot be opened to enlarge.
In the html codes under 2.7 the link has vanished. Why? I did not do anything special. So, testing here.
OK. Found the problem. In the image details, section “Link URL” I have to click now “File URL” and all is well. But remains invisible: “Flash uploader”.
Downloaded the latest Flash Player version 10. Did not work but finally found the problem:
The Automatic Upgrade misses two files that you need to manually upload to the server, to get the files, download the full version of 2.7 to find the files to add in  /wp-includes/js/swfupload/directory:
“swfupload.swf” and “swfupload_f9.swf”