The ones we know about we've just fixed
The ones we know about we've just fixed.
It appears to be photos that have been resized - photos that are the proper resolution to begin with (no more than 780 pixels wide) still show up fine.
To fix the missing photo problem, edit your post and make sure the photo dimension lock is ON (the lock is closed) and make sure the photo is no larger than 780 pixels wide, 720 is even better. Even if you've set the photo to 780 wide, try changing it to something else like 760, 740, or 720. That will bring the picture back.
We're not sure what's causing this, but if you want to avoid it completely, RESIZE your photos properly BEFORE you upload them. Make them somewhere between 720 - 780 pixels wide. If you're uploading larger photos, you're wasting bandwidth and slowing down thread display, especially on photo-heavy threads like the Weekly photo fun thread.
We've also noticed devices that don't have gobs of memory like mobile devices may simply refuse to display larger pictures in order to deal with the limited real memory they have.
Yes, we appear to have a bug around large photos where they will simply disappear, but in a way that's a good reminder to RESIZE your photos properly for posting so you don't waste bandwidth.
If you're not sure how to resize your photos, just Google "resize photos for web posting" and you'll get all kinds of how-tos and tips on resizing photos.
