In Renoise 2.8 this shortcut ( [’] as default) OPEN/CLOSE instrument editor (for VSTi plugins), in Renoise 3.0 its ONLY open, but not close after second press. Important - this behaviour was only when PLUGIN tab active. If i press this shortcut in pattern editor, it’s work the same as previous version of renoise. I don’t know is it feature or bug. Tested on Windows XPx86 and windows 7x64