Unable to Post Replies

I'm new and started my first thread on 4/2. Someone posted a comment and possible fix but I have been unable to reply for over a day. I keep getting HTTP errors when I hit SUBMIT REPLY or PREVIEW POST. I've also tried to private message the person that left a comment and that didn't work either (same error). I've tried this from 2 different laptops from home where we have Comcast. I've also tried from my office. We have Windows 10 at home and XP at the office. Any ideas?

Odd that I can start a thread but cannot reply to that same thread.

Thanks,
Sam

Unable to Post Replies