Note: There might be minor issues in quirks mode (no specified). It works but there might be a bad pixel here or there. DayPilot Scheduler might require some tweaking (IE7 in quirks mode).
See also:
DayPilot renders partially on the client side (it uses JavaScript to modify the DOM tree). Both the resulting DOM tree and supporting JavaScript code are complex and it may happen that it will interfere with the rest of your code, especially:
Sometimes it can be fixed inside DayPilot (especially the CSS) but sometimes not. Please contact support@daypilot.org to check the options.