What steps will reproduce the problem?
1. visiting home page.

What is the expected output? What do you see instead?
At the top of the page, there is an error message related to feeds:
"Warning: Invalid argument supplied for foreach() in
/home/tryphoon/public_html/tumblr/classes/feeds.class.php on line 79"

This error message is not consistent and reloading the page will make this
error disappear. However, changing mahcine or web browser will display the
message again (session based?)

What version of the product are you using? On what operating system?
SVN r314 (appeared since r300)

Please provide any additional information below.
please check tumbleblog at http://tumblr.tryphoon.com