Hi, I'm trying to use this plugin but I'm having trouble with permalinks. They work fine when set at default but anything else I get a 404 when trying to view any events. I have tried it with the Twenty Eleven theme to make sure it was not an issue with the theme I was using but I am still having the issue. Any suggestions? This was not an upgrade from version 4. I installed version 5.1.7 and got these issues.