I usually check the site everyday but missed a couple days. The first I noticed it was Dec. 8 so I’ll say it started somewhere between Dec. 4 and Dec. 8.
During that period there were updates to several plugins due to the release of WP 5.0 – I have NOT upgraded to 5.0 yet.
During that time period:
– Plugin Accordions updated
– Plugin Contact Form 7 uninstalled
– Plugin Ninja Forms installed
I just tried reactivating your plugin and the problem still exists – cannot get past the Fremius nag pop-up by clicking skip.