Since fixpack-portal-149, modal window is wrong positioned in iPad devices, making not possible to work with it or to move it.
Steps to reproduce
1.- Start Liferay 6.2 with fixpack-149 or higher
2.- Create a Structure with a 'Documents and Media' field
3.- Create a Template with that structure
4.- Create a Web Content with that structure.
5.- Access with iPad to the administration of that web content and try to add a document.
A modal window is opened and centered in such a way you can select a document.
The modal is opened but wrongly positioned so you can not interact with it.