Curious! After updating to 1.1.3, my Vendetta window resolution seems locked at a rather small size. I have a 1280x1024 display, so the 1280x960 resolution usually covers the majority of my screen. Now it's a small window in the middle. Furthermore, when I change resolutions and re-load textures, etc, I get a new Vendetta Window. The old one becomes blank and sits behind the newly generated one.

Hmm, I just cycled through a bunch of them. 1152x870 is actually showing up as larger than 1280x960. I think 1280x960 and 1280x1024 are the only window sizes which are too small.

-Asp

The windowed resolutions create windows that have a client area the desired size, so the outside part of the window is actually larger than the desired size. OS X doesn't allow windows larger than the desktop size to exist properly so VO switches to a lower resolution.
Apparently my heuristic for when this happens isn't perfect because the width is the same but the height difference between your 1024 desktop size and 960 resolution choice is larger than the height of the window title bar. So, for the time being, choose a smaller res until I get it sorted out.