hammer editor is at it again

hello, im sure this is another hot key of hammer i managed to press on a retard occasion, but whenever i click or drag to make a block or anything, it drags the grid instead! needless to say i have no idea what to do, please tell me what i have done to make this happen (so i can fix it next time)

Spacebar.

HAH! how did i overlook this? don’t ask me (please)! it worked, thanks alot!