I have found the issue. Strangely it was the post processing image parser throwing an error message. Strange, because it hasn’t been changed in a while. I will look into that in more details on my test servers. I’ve fixed the issue, by changing 1 line in the plugin code, now it should work fine.
I’ve also switched back to the index table engine, and checked if it’s indeed running correctly – it does now.
The back end freeze issue: I believe it was only a script cache related problem. Sometimes when updating a plugin and the script files change, the browser might not immediately re-parse them, or if using a cache plugin, it might still serve the older file to the browser. The script files are loaded with a version string to prevent that, but of course often it does nothing at all.
I usually clear all my caches, including page, database, script, CDN, varnish, browser cache after updating a plugin – as I’m usually getting similar problems. When I check the source files, the cause is almost every time an outdated file serving. There are so many layers of cache nowadays, that it’s really easy to get an error message.
Ernest Marcinko
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