I have a problem, the system does not display Waterfall and Screen Shot in the section: summary>
If the screen shot shown in the screen shot section
Any idea what could be the problem?
(translated with google, sorry)
https://sites.google.com/a/webpagetest.org/docs/private-instances#TOC-Troubleshooting
I can pretty much guarantee that your php install is missing the GD library.
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The problem was the GD library, thanks Pmeenan
Hello since its my first post I have to say congratulations for the nice work and the ec2 ready testers thanks!
I thought its best to reply to this thread since I have similar problem so its easier for other people in the future to find it.
I have the same symptoms and in my php i have
Command ‘./configure’ ‘–disable-pdo’ ‘–enable-bcmath’ ‘–enable-calendar’ ‘–enable-discard-path’ ‘–enable-ftp’ ‘–enable-gd-native-ttf’ ‘–enable-libxml’ ‘–enable-magic-quotes’ ‘–enable-mbstring’ ‘–enable-safe-mode’ ‘–enable-soap’ ‘–enable-sockets’ ‘–enable-zend-multibyte’ ‘–enable-zip’ ‘–prefix=/usr’ ‘–with-bz2’ ‘–with-curl=/opt/curlssl/’ ‘–with-curlwrappers’ ‘–with-freetype-dir=/usr’ ‘–with-gd’ ‘–with-imap=/opt/php_with_imap_client/’ ‘–with-imap-ssl=/usr’ ‘–with-jpeg-dir=/usr’ ‘–with-kerberos’ ‘–with-libdir=lib64’ ‘–with-libexpat-dir=/usr’ ‘–with-libxml-dir=/opt/xml2’ ‘–with-libxml-dir=/opt/xml2/’ ‘–with-mcrypt=/opt/libmcrypt/’ ‘–with-mhash=/opt/mhash/’ ‘–with-mysql=/usr’ ‘–with-mysql-sock=/var/lib/mysql/mysql.sock’ ‘–with-mysqli=/usr/bin/mysql_config’ ‘–with-openssl=/usr’ ‘–with-openssl-dir=/usr’ ‘–with-pcre-regex=/opt/pcre’ ‘–with-pic’ ‘–with-png-dir=/usr’ ‘–with-ttf’ ‘–with-xmlrpc’ ‘–with-xpm-dir=/usr’ ‘–with-xsl=/opt/xslt/’ ‘–with-zlib’ ‘–with-zlib-dir=/usr’
so GD and ZIP and freetype are already installed but I cant make the waterfall to work
My version is 2.9
only difference is I get this options in the page
Generate a custom Waterfall
but nothing happens 
Any suggestions?
thank you in advance
In case anyone has same issues in the future in my case it was php which should be more/above > 5.3.x
I overlooked it in the documentation