If I try to create a new, untitled writer document or web document from the command line with "libreoffice --writer" or "libreoffice --web" the splash screen works fine, and the window menu bar and window decorations come up, but nothing else does, and it gets frozen that way. Editing an existing file works just fine, as does simply doing "libreoffice" and using the mouse to select a document type (though using "libreoffice" and trying to use a keyboard shortcut causes the document chooser UI to freeze up). I'm using Fedora 20.
Slight correction: when using "libreoffice" in the command line to get the document selector, the UI always completely draws, but sometimes it starts out frozen, while sometimes it doesn't start out frozen and can become frozen if a keyboard shortcut is used.
Are you using KDE?
Yep, I'm using KDE 4.12.3, with the default KDE window manager.
*** This bug has been marked as a duplicate of bug 77128 ***