Unreadable tiny names in LibreOffice Calc sheet tabs
This issue happens in LibreOffice 4.3 and older with some desktop themes. To solve this, either change your desktop theme or increase the value of
GtkScrollbar::slider_width in the file /usr/share/themes//gtk-2.0/gtkrc. In my case, the line was commented out. Activating it with the default value did the trick.
Restart LibreOffice Calc to see the result: