So, I'm able to get one side of the window out, but the other side won't come out. It appears that the window isn't quite square in the frame. The space between the top of the window and the frame above it is slightly smaller on the stuck side, hence the dowel won't clear the track on the bottom. My idea is to use a chisel or a fine dovetail saw to cut about 1/8" off the top of the window on the stuck side so the window can be lifted up to clear the sill. Could be hard because I wouldn't be able to cut past the dowel, which it turns out is metal. I could also try to lift the bottom corner with a crowbar.
The plastic sill can't be removed without removing the windows; it's held in by the dowels in both windows. I tested another window and it came out easily. Maybe the humidity has swollen the frame and casing of the stuck window.
One way or another, the window has to come out so the panes can be replaced.
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