What version are you running? 1.5 Beta1 What's the URL of the page containing the problem? http://demo.reviewboard.org/r/50/diff/#index_header What steps will reproduce the problem? 1. Have a diffset with at least 2 files 2. Expand a section in the first file 3. Add a comment on one of the previously added line, publish 4. Reload the page, the expanding section is now collapsed 5. Expand the section again. The comment is not visible. In the example, the diffs have 3 files, so I put a comment on line 10 of the second file. The comment is visible only is you use the expand all button. The issue is in diffviewer.js, function addCommentFlags(table, lines) gHiddenComments = remaining; addCommentFlags is called for each file, so gHiddenComments is overwritten by the last file. I'm testing a fix. What is the expected output? What do you see instead? What operating system are you using? What browser? Please provide any additional information below.