Tag not monitored by Microsoft.
There are problems with the forum webpages and this is one of them.
There appears to be a timer when viewing or attempting to post a comment or answer.
To "work around" this problem until it is acknowledged and troubleshooted you can perform the following steps:
a) click the browser back arrow when you see: 404 - Page not found
Hmm, we could not find this link. If you feel you are seeing this page in error, please enter a Site feedback and tell us which page you expected to find.
b) copy and remove whatever is in the reply box using ctrl + x
c) refresh the browser webpage
d) paste into the refreshed reply box
e) click post your answer
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Please remember to vote and to mark the replies as answers if they help.
On the bottom of each post there is:
Propose as answer = answered the question
On the left side of each post there is /\ with a number: click = a helpful post
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