Excluding a page/url from batcache

Hi we have two webheads under one Varnishd load balancer. The memcache server sits on the same VPS as the load balancer.

We are trying to use batache to manage memcache on the site. However, everytime we switch batcache in we see the following problem.

A new user comes to the site.
Registers.
Activates their account.
CANT LOG IN.

At this point the user has been created, but only deactivating batcache will cause the cache to clear and allow the user to log in.

We have experimented with other memecache plugins (wp-ffpc) and didnt have this issue.

Is there some way to exclude either the homepage or wp-login.php from ever being cached?

Thanks

http://wordpress.org/plugins/batcache/