Issues with a Joomla! template
AllEvents is only tested with the default template delivered with Joomla! (Isis) and we only support this one.
AllEvents is optomized to run with almost all Joomla!. We especially check that it runs with the well-known template providers (as Joomlart T3, Rockettheme, etc.).
Our CSS code is usually prefixed. So, you your template should not be disturbed.