Cannot open more than one text document

I cannot open more than one libreOffice writer document together as I used to do with former versions of LibreOffice.
I have LibreOffice, and Windows 8.1. My pc: HP Pavilion 4 GB RAM.
Thank you in advanced for answers.

Are you sure? Does LibreOffice complain about something? Please note: 4.4. versions come with a new “feature”: Trying to open a document created with another software of the family (OOo, AOO. ?) you will be prompted about this fact. The windowlet used for this is often hidden by other windows as I can say from my experience.

(Currently working wit V4.4.2.1 on Windows 8.1)