The reply box isn’t showing up even though logged in ?!? *
Check out Tanker-Builder at
https://cs.finescale.com/fsm/modeling_subjects/f/7/t/192638.aspx?page=2
More precisely, is it that the Reply button is hidden? For me, Reply and Quick Reply were both hidden on your post, till I refreshed the page. Then the buttons were available, and clicking Reply opened the editing panel, for me to type this post. I have to look at other posts; I’ve been in the forum for around 10 minutes, and hadn’t noticed if the buttons were hidden. But I haven’t read every post, either.
OK, I looked at Tanker Builder’s thread, and I can see that Reply/Quick Reply are hidden, but only on your reply posts. The other replies show the buttons. Your signature photo is rendered as a large image, of which I can only see the left-hand side the photo. Again, if I refresh the page, the buttons are revealed, but more interestingly, your signature images are now rendered completely and in a smaller thumbnail size.
I think the issue is with the forum processing your photos. Not that you are doing anything incorrect, but that forum should be able to handle the photos but doesn’t.