Space Bar no longer changes viewports

Not applicable
01-16-2019
09:28 AM
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When I tap the space bar to go between the 4-view panel and then tap again to maximize a specific panel, it no longer does anything. Instead something called 'Zoom in view' gets turned on. I've tried the 'delete Prefs and re-open' trick, and nothing, I've also tried to look into the hotkeys but I don't know the original hotkey command (its already labelled as 'toggle zoom in mode').
I have failed at googleing this and could really use the help, what have I unknowingly done/clicked to make this happen?
Caroline