Just to follow up on the problems I had earlier with posting that lasted a couple days for posts 24 & 25 in thread:
https://www.physicsforums.com/showthread.php?t=237570&page=2
Probably won't mean much to Mentors and maybe not even a System Administrator unless the problem reoccurs. So this is just FYI for the admin, if it might be needed later.
I cut and paste into and back out of MS Word 2007 when making a post. And my library system admin has seen some Web Sites have problems with the double quote symbol (“) from the new version of word. And I do notice when typing directly into physics forums the quote symbol does look a little different. Doesn't make any sense to me that this could be a problem except wherever I pasted a copy of the post text post into other parts of Physics Forums, the same ("The page your looking for can't be found.") from PF was displayed. [Again, I could tell it was coming from PF, as it included the PF header Google ads].
Once that error occurred I could no longer post in use that part of PF. As that part of the fourm would from then on only give ("The page your looking for can't be found.") error blocking access to that thread; the PM - Private Messaging system; opening a new thread in any forum I had tried to paste in the text detail for reference.
Including failing to be able to post the detail or any additional posts to this “Forum Feedback & Announcements” Forum, even after logging out clearing local cache and logging back in.
I’m hoping that by allowing some time, whatever system, network cache or other issue may have been involved has hopefully just aged out of the system. And I can add this info – nothing to fix now I hope, but if it happens again to someone else, the above might be useful to a system administrator.