Sometimes OS X is so ridiculous.
I just wasted 20 minutes on this bug. I spent 10 minutes trying to figure it out myself. Deleting the .plist file didn't work. I used a text editor to change things in the .plist file and couldn't find the right thing to change. Searching the .plist file for "height" or "window" finds nothing, "size" turns up two unhelpful things, and I couldn't find a number that plausibly looked like the window height in pixels. The second 10 minutes were spent searching the internet, until I found this.
Thank you so much! And Apple: FIX THIS! FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT, FIX IT!
Hint: Perhaps make the '+' button cycle through more than just two sizes (namely 'regular' and 'teeny weeny playback control buttons only'). Perhaps make it cycle through 'regular', 'smaller', and 'teeny weeny'. Or you know what? Don't make the '+' toggle teeny weeny mode at all, that is stupid. Put teeny weeny mode in the 'Window' or 'View' menu.
Otherwise I might have to shiv someone next time I hit a bug like that.