I’m having the same issues after updating to 4.2.2.1
Either I’m getting flaky behaviour on the front-end, or the orange progress bar just gets to about 56% and then stops.
I waited nearly an hour to try and get about 20 events populated.
The recurring event had custom recurrence – tuesdays and thursdays at the same time until december.
I’m also using event tickets pro, but the problem occurred before I had even created a ticket bfore the event.
I’ve spent hours trying to troubleshoot this and the client is getting really antsy.