Game Window Size

I think that my game window is the wrong size. When using one of the default title graphics or a map of the default size (17 x 13), there are black bars on either side of the screen. The messages are set to fill the entire width of the screen, but it's a minor problem for the other stuff. Also, when a battle begins the transition animation seems to be off-center (you can see the start of a second circular pattern on the right side), and I think that might be related.

PS. Kind of unrelated, but is there any way to change the battle transition animation in Ace?

You have to make sure your transition size (in Graphics/System) is also set to the same size as your game window. For example, if your game is 640 x 480, your transition has to be the same size.

Is there a way to change the size of my game window? And how do I check what size it is?

From your description I assume that you're using some of yanfly's scripts, because yanfly's core sets the window to a widescreen format by default - check for the options and resolution insite that script and correct them (yanfly's core script also lists the default and regular max values for comparison, you can read the correct numbers there)

Yep, that's the problem. Thanks.