Hello,
Please follow the instructions in this documentation to activate debug in your site to see any PHP errors recorded that can provide insight on to whats going on. Please reply with a link to debug.log file. If you are not able to do this please send us FTP access to your site so we can do this for you.
I see what you are referring to here. please allow me sometime to get a new update to API addon which will address these slight style issues.
please try this patch fix.
move the code for loading lightbox. As for eventON addons we are going to add necessary codes to support these settings in the future as it does not fully support right now.

That seems to have worked. Incredible support- thank you!
Hello Mascha, Unfortunately we can not provide support for 3rd party wc template editors.
EventON ticket email is not a part of the WC emails, but it is triggered when WC order emails are being sent.
You can customize the ticket confirmation email by creating a child theme, here are some basic guidelines
https://docs.myeventon.com/documentations/customize-ticket-email-template/
I am still seeing 13 active plugins, May I disable others and test?

Well if you save the event it will sort auto by ascending order for repeat date. Which would make a nice incremental repeating dates for future not just random repeat event dates.
Only way to customize repeats and add repeats is to
1. add all the repeat instances and then customize
2. add repeats that have dates higher than last repeat instance.
How can we replicate this error on our end? Selecting Indiana East time for event in event edit does not create this issue for us.
Perhaps more than the code, could it be your server that is unable to process this time zone because of issues in the timezone database? since you mentioned after upgrading the server you started seeing this issue.
Thank you Dick for sharing your opinions and debugs. We will further investigate this and incorporate necessary fixes in the next version release for eventON.
Thank you for letting us know will be releasing a new update with the fix.