Nothing serious, hopefully already notited, but in using the GTK+ version
with GNUS, the Emacs window shrinks over time due to miscalculations in
the frame size. This may happen with other applications, but I think
GNUS re-divides the frames so often that the effect is very pronounced.
I think what happens is a miscalculation of the mini-buffer height. When
empty, it is one size, when something is printed the whole frame grows to
accommodate the text, and then when we go back to a sub-height minibuffer
the whole frame shrinks but just a tiny bit more than when it started.
Over the course of the day, my 43-line frame will slowly shrink down to
about two dozen lines.