Issues with cache in 4.7.0-rc2

Hi.

I'm playing with drupal 4.7.0-rc2 and found some issues with cache.
First I isn't aware about 304 HTTP answer. Any page is being sent as new but validators are sent well, however 4.6 sends 304 and all necessary validators (Etag and Last-Modified) when page is cacheable and was not changed. Moreover, if I turn on cache I receive anticaching headers like
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: once upon a time at 1978's year. (Is it Dryes's birthday? :)))

But with activated cache I meet some troubles in IE and Opera - after some page loads pages become empty - just blank page! F5 and Ctrl+F5 don't help! I tried to debug it with Fiddler - but there's nothing extraordinal. However Firefox shows pages well.

Is it possible to fix it?
Thank you.

Eugene

P.S. My configuration: Apache 2.0.55 + mod_deflate + mod_cache + PHP 5.1.2 (as FastCGI)
but two later were deactivated by following lines:

CacheDisable /
SetEnv no-gzip 1