That strikes me as a local to you and your old Mac issue.I can't post in my Linkedin thread but I can post elsewhere. Tried twice and tried quoting someone to no avail. It's only in that one thread so far.
Using my older Mac. Not due to character limits. And not posting rapidly.
But I was able to post using my new Mac.
The first thing to do is to clear your cache and cookies on the old mac.
Log off of AW (Make sure you know your password).
Clear your browser cache and delete AW cookies.
Completely quit your browser, including closing all tabs and windows.
Reopen your browser, and log back on to AW.