Same issue as documented here: <a href="https://app.roll20.net/forum/post/1142692/#post-11" rel="nofollow">https://app.roll20.net/forum/post/1142692/#post-11</a>... Detailed Description of the Problem When developing a custom character sheet for my GM, the "preview" function does not work after saving, it simply renders a blank page. This is only a problem with the "Preview" tab on the custom character sheet creator. When loaded in a campaign, everything works properly, it would just be much more convenient to get the preview tab working. Steps to Reproduce the Problem Occurs automatically when entering CSS and/or HTML in the Custom Character Sheet HTML or CSS tabs. HTML entered (any will do): <div><p>TEST</p></div> CSS entered (any will do): p{ font-weight:bold; } Description of Your Setup (Browser + Version, Operating System, etc.) Chrome 39, Firefox 34 X11 Linux x86_64 Screen Resolution: 1920 x 1200 JavaScript: Enabled Flash Version: 14 I also tried various HTML/CSS from the character sheets repo on <a href="https://github.com/Roll20/roll20-character-sheets" rel="nofollow">https://github.com/Roll20/roll20-character-sheets</a>