setting to stop objects from going through each other?

[deaconjj]

I've used Chief since like v6, and I've never had this problem.  I was always able to take an existing vanity, move it, and the walls would stop it so I could easily tuck it in a corner. Or at least snap to another vanity corner. Right now, the walls are not stopping the vanity.  Similar with windows -  I could slide them up to one another and they'd stop. Now, they fly right through eachother. 

 

Did a setting of mine get messed up somewhere? I have been searching through preferences and defaults. Thanks in advance!

 

[deaconjj]

Thank you!