Browsers are a dime a dozen and you would think that the differences in behavior are almost zero. Unfortunately, this is not quite true.
CentralPlanner uses the latest technologies and demands a lot from the browser. We therefore recommend using a modern browser based on Webkit technology in order to be able to use the full comfort. These currently include the browsers from Apple (Safari) and Google (Chrome). However, it should also be possible to use CentralPlanner with a current version of Mozilla Firefox without any restrictions.
We only advise against using Microsoft Internet Explorer. Older versions in particular (prior to version 9) often do not behave in accordance with web standards.