WP 4.1.1 seems to need a lot more memory than previous versions. Just add
define('WP_MEMORY_LIMIT', '256M');
in your wp-config.php file just before the /* Stop editing */ comment line and you should get rid of the blank screens. If you can’t access that much memory, go for less, but from my tests the minimum required is 96M. This is probably a bug and will prolly get fixed a.s.a.p. by WP devs. WP is supposed to run fine on 64M, or even 48.
EDIT: I wrongly assumed you have the memory leak bug that seems to be quite big at the moment related to updating existing WP installations to the latest patch. Your issue has to do with wrong options set in your DB. Here are the SQL queries I run when moving WP installations to a new address:
UPDATE wp_options SET option_value = replace(option_value, 'http://www.old-domain.com', 'http://www.new-domain.com') WHERE option_name="home" OR option_name="siteurl";
UPDATE wp_posts SET guid = replace(guid, 'http://www.old-domain.com', 'http://www.new-domain.com');
UPDATE wp_posts SET post_content = replace(post_content, 'http://www.old-domain.com', 'http://www.new-domain.com');
Without any logs I’m afraid I can’t be of any further help.