Build Your Own SLA/SLS

Thank you, PB, for the CW 'How To' doc. I looked for it before, but couldn't find it. With a little help from you and the How To, I'm a little closer to printing my first part! The weird 'magnet' behavior started (this time, anyway) when I saved the file. I recorded it (attached). I tried to repeat ...

New to all this...Basic questions: 1. Do I have to close the program to start over or view a new part? 2. Are the inch->mm and mm->inch scale buttons just repeatable scaling multipliers? 3. Is it just me, or does the right menu shuffle back to its home position on each click (in a new area) for ever...