OK, so when you opened the thread you noted that you had tried deactivating all other plugins (except for The Events Calendar and optionally Events Calendar PRO) and simultaneously switched to a default theme such as Twenty Twelve – did that solve this/were you able to identify a conflict by running through those steps?
Failing that (or in addition), can you try visiting Settings > Permalinks? You need not actually change anything, just visiting this page causes WordPress’s rewrite rules to be flushed (the rewrite rules are used in the routing process where decisions are made about which page to show).