Comments Not Working

1. For some reason, the comments won't post to the theme. I'm trying to test out everything before I purchase the theme.

Here's the error I'm getting after clicking the "submit" button:

________________________________________________
Page not found
The page you are looking for might have been removed,
had its name changed, or is temporarily unavailable.
Please try the following:

If you typed the page address in the Address bar, make sure that it is spelled correctly.
__________________________________________________


Also, where's the CSS code to change the error color. Right now the font is black and the BG is black so it's not showing up. I just knew to hightlight it to see the text. But I need to change the color to white.


2. When I purchase this Theme, will I lose all my custom edits and have to start over again ... that wouldn't be fun. :(


Thank you,
Sharon

Can someone please advise on a solution for the above...

Found the answer.... apparently the Jetpack Plugin was causing the problem. The solution is to Deactivate the Jetpack Plugin and then Reactivate it. Works fine after that.