Strange interaction between modules:

Newsfeeds 04.02.01 + DNN 6.1.5
Survey 04.07.00

1) Install Survey module
2) Install NewsFeeds module
3) Create a new page.
4) On this place a new NewsFeed module on page.
5) Below this place survey module on page
6) Add and display a RSS feed on NewsFeed module
7) Create 1 question for the survey module.

THEN..

Click on the View Results link on the Survey module and the feeds from the NewsFeed module disappear.
Or...
Answer a survey question, this will postback the results and the newsfeeds disappear, but can be restored by refreshing the page.

This happens whether AJAX is enabled or disabled on Newsfeeds, and whether NewsFeeds inherits All Users permissions from page or it is explicitly set.

I posted as a bug on CodePlex, and also in the NewsFeed module forum.