I sent him an email offsite. He has already responded to me, and asked if I was still seeing the error. I am not. All functionality that I was having issues with earlier are back to normal. It was intermittent for me - PMs weren't working, then they were, then they stopped. They are working again for me.
I am still having issues replying when quoting. I have informed him of that.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 10/25/2023). I have added a large portion of my inventory to the site, and currently have trading turned off (details are in my profile). I have (finally) unearthed my 2 very large boxes of Star Company minor league sets and they are available (email for details).