Hello, Today I upgraded from MTOS-4.1 to 4.15b5b-en. I noted in the release notes the addition of SimplyThreaded so went and refreshed the comments template.
I republished two test entries in my test instance and tried to add a reply to one of the existing entries--it returned with a web page of: /** Comment Submission Error
Your comment submission failed for the following reasons:
Invalid request
**/ I went and looked at the Apache error_log which shows:
/* [Wed May 14 20:21:23 2008] [error] [client 192.168.1.2] "my" variable $user masks earlier declaration in same scope at lib/MT/App/Comments.pm line 127., referer: http://www.dtschmitz.com/cgi-bin/mt/mt-comments.cgi */ I am rolling back to the original flat comments template until I hear back from you.
Thanks. Dietrich

Upgrade to 4.21 ;)