Interesting, there must be a few bugs with Flyouts at the moment. I didn't have any issues with the height and width like you mentioned but about a week ago a Clients Flyout widget was all of a sudden not able to be placed on the right side of the screen using the right: '10px' parameter and it kept rendering on the left of the page.
With Client Script being such an vital part of being able to provide more intuitive, user-friendly - and in some cases, simply usable - CRM solutions, its very concerning that the Zoho Client Script Team regularly seem to break code and push it live without thorough testing.
Really erodes any trust you may have in their ability to provide an enterprise level service.