agabu on "[Plugin: Events Manager] 404 error on my bookings page"

Hello,

I got this 404 error on manage my booking page.
EM v 5.2.6
WP 3.4.2

1) Already tried re-saving your WordPress permalink settings in Settings > Permalinks - does not help.
2) Switching to Twenty Eleven Theme - does not help

This problem does not occure when choosing default permalinks format. Yet I'd like to use /%postname%/.

Could you be so kind to suggest something else?

http://wordpress.org/extend/plugins/events-manager/