I can't remember how I did this, but my buttons in Synaptic and other apps are very large. I cannot remember how I made them this way. I tried changing the theme and icon set, but that didn't change anything.
Yep.. That is usually an issue with specific icon themes chosen. Change to another icon set. (I see you tried that, but LOG out/in). Maybe its also with the other set you choose. Try another. There are plenty of nice ones out there to try. Moka, Numix (circle, square, faenza, et). ;)
Cool, thank you! :)