I have the same issue as the OP on upgrading to ai1ec 2.5.30 from 2.5.29
My site is running WP 4.9.5 and PHP 7.1.16
I was able to roll back to version 2.5.29 and posterboard etc. now works OK once more. FYI I use a plugin called ‘WP Rollback’ : https://www.ads-software.com/plugins/wp-rollback/
Update:
I just updated once more to 2.5.30 in order to try the ‘Dashboard -> Events -> Theme Options and hit Save Options’ suggestion made by @bsokic above. However, this time the posterboad view was working fine right from the start. No need to (re)save any settings… ??
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This reply was modified 6 years, 7 months ago by saplomb.