Yes, I'm a new member. This somewhat dated link has a peek at what to expect; I wouldn't yawn but I'd take a couple of their center-pinch lens caps and that shiny red strap first.
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Sam, the CR tech guy fixed it.
It was not something simple like cleaning up the database, but he eventually figured it out. It turned out to be a combination of bugs in the forum firmware (upgraded to latest version now), and limitations on the size of pages. My allowing 10 large thumbnails probably is responsible for exceeded the memory settings on pages, so he figured that out and overrode the settings to allow for larger pages.
Mary had a little goat
she loved when it was new
but then it chewed up Mary's shoes
and now it's vindaloo
If he is able, he'll do the maintenance tonight, I think he is traveling, so it might not be possible.
There are some database tools to fix indexes and lost posts, but I have never run them, and its not a good time to learn.
I checked the 200-400mm topic in the lens gallery, and something is definitely wrong. I see nothing at all, so there must be some corruption in the database. It will have to be rebuilt I think.
I'll let CR guy know about the issue, he has some support people who only take orders for things like that from him.