Showtalk said:

I was not changing anything. I had just reloaded my forum and a strange image showed up

Right - that was what was happening to Paul. I was uploading images and he saw them. They'd be there for a bit and then disappear.

It was this image.

And you saw that at Members Service as well?

Yes, but not here.

Probably the same thing then. I tried bugging out the cause back then but after a bit getting no clues decided it was not worth annoying the members at effected forums for my own curiosity.

You are seeing Opinion Polls as you should be now?

Yes, it switched back the same day.

Yes - it's a temporary "takeover" . Very odd that it does not occur more often. I know of at least one Zeta forum where the Zeta background image changes frequently. Unless it is like a sound in the forest - and no one catches it (or reports it)

I’ve never seen it before.

I recall you noticed this before ... this happens when changing the background image in a forum and then it also shows in other forums?

Yes- it shows up temporarily.