On saving a timeline (a new one or an updated existing one) I get two of these errors:
Warning: Creating default object from empty value in /pathtowordpressinstall/wp-content/plugins/wp-veriteco-timeline/wp-veriteco-timeline.php on line 60
Followed by two of these errors:
Warning: Cannot modify header information - headers already sent by (output started at /pathtowordpressinstall/wp-content/plugins/wp-veriteco-timeline/wp-veriteco-timeline.php:60) in /pathtowordpressinstall/wp-admin/post.php on line 235 and pluggable.php on line 1121
I also had the never-ending "loading" problem until I updated an already existing timeline entry. After that the timeline loaded.
This is a development site and dns for the domain is not pointing to it yet. I don't know if that could be having an impact.