October 09, 2012, 01:11:06 pm
Hi lordbibo, the only thing I can think of is this:
Excerpt from the Tips, Tricks and Shortcuts thread:
Place object mode -> (Z) + Left-click: Place a new object with +/-0 to 50% random scale.
Is there anything that might be causing the Z key to be pressed while you're placing models, e.g. any USB devices such as joysticks, tablets etc? If so, please try to disconnect them to see if it helps.