NB As part of this release I removed the Category Column functionality. I took this decision to simplify the complex logic (you wouldn’t believe how not trivial that was) and also to reduce the impact of the plugin when not activated as the header template messed up several people’s installs. This will also make the plugin mildly more robust to changes in core. In any case, it’s not really functionality that is central to the aim of the plugin and actually competes with space you could have larger images in.
If you still want the Category Column, but are not bothered about thumbnail previews, pls investigate this Theme Component instead Add Category Column
For your next upgrade, consider setting up a representative staging server and check out the upgrade first there before upgrading your Production instance. This shouldn’t cost too much because you can switch that server off most of the time.
That way you can still discover the problem but not be so reliant on an immediate fix and we can all be a lot calmer about it. Your users will then never see an issue or significant downtime. And you are not so reliant on someone who is not on your payroll.
Unfortunately with plugins there’s always a risk things might go wrong after an upgrade. Luckily I was sleeping light and happened to check in here at 4am but I cannot guarantee to get to issues with such short notice every time. I really can’t guarantee any availability apart from ‘best efforts’. This is why you need to protect yourself and take ownership of the solution.
Sure, that’s expected, but we don’t support CDN delivered thumbnails I’m afraid. Thing is though, they may cache in the browser in any case, so are you judging things on first load or subsequent transition?