The PlayMyth 1.2 plugin for Myth 2 will be released sometime in the next 2-3 weeks. Everyone using the current 1.1 plugin will need to upgrade to the 1.2 patch in order to continue playing on PlayMyth.net. This plugin fixes several bugs with the 1.1 plugin (especially on Macintosh) and allows for users to select one of 6 different themes or build their own.
Please aware that you must upgrade to the 1.2 plugin once it is released. We will have a firm release date within the coming days. This post is designed to notify you in advance that the change is coming :)