How strange – I’m sorry you’re experiencing this.
It sounds like this only started happening recently: did anything coincide with the problem (theme updates, plugin updates, etc)?
Can you also try these steps:
- Ensure you are running the latest versions of all our events plugins
- Deactivate all other plugins
- Switch to a default, unmodified theme such as Twenty Thirteen
- Visit the Permalink Settings page (you don’t need to change anything, just visiting this should ‘clear up’ the rewrite rules table)
- Does everything work now?
If that does resolve the problem, please reactivate everything checking at each stage to see if the problem has returned: that might allow us to zero in on the root cause.