I posted this in the other sticky thread, but the issue is spread over so many threads I wanted to make sure my feedback was seen:
Everything is working for me now across all devices. For my laptop, I did literally nothing and the pics started showing again. For my iPads, I had to clear the caches (website data) and everything showed up again.
So, here's the interesting thing, it may not have been Forumotion's fault after all. I received an email reply this morning (Monday) from PB support and here's what they said:
Thanks for reaching out.
I am sorry to hear that you are having issues with your embedded images. We did experience some issues on Friday where some of the embedded images stopped displaying. However, this issue was resolved immediately.
I also checked the thread that you shared and I was able to view all your images/gifs. If some of the forum members are not seeing your images, they may just need to clear their browser's cache and cookies to see the updated page.
Let me know if you still continue to see issues with your images after clearing your browser's cache and cookies.
However, it was odd that my PB pics were showing up on OSW, SSF, and 6thD/SAG, but not Forumotion. So it seems something specific to PB and how it is read by Forumotion was an issue, but PB is acknowledging that they did
have a problem on Friday
(which is the exact day I noticed it and started posting about it). I take their claim that it was "resolved immediately" with a pound of salt, since it actually only started working for everyone this morning. I guess by "immediately" they meant "by the next business day," which is unfortunate since it was over a weekend and we were all tearing our hair out for almost three days trying to find a solution.
All's well that ends well, I guess. I apologize for wasting people's time and energy trying to chase down a solution, and for causing a bit of drama, but I'm thankful for all the genuine concern and effort by all who pitched in. I suppose the good thing is there is now a knowledge base here about how to best post pics, what works and what doesn't, and some of the specific quirks of each hosting service. Both Forumotion and Photobucket support responded rather quickly to our enquiries, which is good, although in the end it was really nothing that we did that caused it nor fixed it (other than fiddling with our specific devices and clearing caches, etc.).
Thanks again to all, especially for GFan's patience, DFC's relentless pursuit of FM's support, and all the other members who chimed in and tested and posted to get to the bottom of it (Stryker, rogerbee, Kukolka, and everyone else I'm neglecting to mention (this is like an Oscar speech!)).