Same problem here.
The only thing that has changed since Firefox 17 is upgrading to 18.
Same issue, at odd random times, half of the noscript menu is invisible.
I only use it in the Navigation toolbar, and not on the Add-on bar.
I've always used it with the auto open on mouse hover if that helps.
Had been using 2.6.4.2
tried updating to 2.6.4.4 and same problem.
other than updating to 18, absolutely nothing else has changed.
It happens at random times on random websites.
In fact just happened now as i moved the mouse over it.
Left clicking the icon then "reloads" the menu and it all shows up.
The only thing that has changed since Firefox 17 is upgrading to 18.
Same issue, at odd random times, half of the noscript menu is invisible.
I only use it in the Navigation toolbar, and not on the Add-on bar.
I've always used it with the auto open on mouse hover if that helps.
Had been using 2.6.4.2
tried updating to 2.6.4.4 and same problem.
other than updating to 18, absolutely nothing else has changed.
It happens at random times on random websites.
In fact just happened now as i moved the mouse over it.
Left clicking the icon then "reloads" the menu and it all shows up.