It would help if you could give a link to a document or page that tells how LastPass determines to do something, that is, how it determines that you're on a login screen and what to fill in in what fields.
Kees
The Password Manager does not insert an "email address" nor "password" in that 'white' login window. Help please.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic