[TYPO3] news_feedit, mth_feedit, feuser admin - header information already sent, but which one is making the conflict?

[dave typo]

Hi everyone, I installed news_feedit, mth_feedit, and feuser_admin, and when
i preview the news_feedit content, I get header information errors. I also
get a little display in the upper left hand corner that indicates the uids
(zero) which I don't understand.

the extension works fine, but I want to get rid of the errors...

Does anyone know which of the three extensions is creating this error? there
is no help examples that I could find in english concerning this topic.

- oh, and no tables in my mysql database appear to be corrupt or crashed,
which is what I had originally thought was the problem...

thank you for any input or suggestions on how to solve this...

-Dave