What version are you running?
1.7.11, 1.7.13
What's the URL of the page containing the problem?
http://...(private network domain).../r/17496/diff/#index_header
What steps will reproduce the problem?
1. push the first Show all line (+) button in any file in diffviewer
2. no result
3.
What is the expected output? What do you see instead?
show the beginning section of the file
What operating system are you using? What browser?
Ubuntu 12.04 LTS, Chrome, Firefox
Please provide any additional information below.