The bug has to do with the blue panel with the small round icons(play,marked wanted/unwanted etc etc.) when you change the width of that panel and you make it smaller than the total icon width the 2 last icons (script and trailer) are moving over the 3rd and covers them
my suggestion is that if you make the panel's width smaller than the width of the icons that holds the icons should be shrinked too and also you should put a minimum width so further would not be possible to go... something like that.
I hope you understood what i said (my english sucks :P)