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A while back this thread was discussing issues with the GTK3 improvement of fading scrollbars obliterating the bottom line in Synaptic
http://www.q4os.org/forum/viewtopic.php?id=2039
Of course it impacts other GTK3 stuff as well.
Sadly I've long since stopped using Q4OS as I cannot run beyond Jessie on my hardware.
However, inserting the following new line in /etc/environment
GTK_OVERLAY_SCROLLING=0
has fixed this annoyance globally on my Ubuntu 16.04/Trinity setup - so may be worth a go.
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