I am not an electrician. I did install a new 4 way switch yesterday into the system. I was of the understanding that I would wire it with red across both top terminals and white across the bottom terminals. Does that matter?
Yes, it does matter.
Various brand switches may be connected differently internally. It will be embossed on the back of a new switch.
It may say, "in" & "out"
You may need a multi meter to check old switch, if not marked.
Put the hot leads to the "in" and the load to the "out" screws.
Now that I know it's an older home, I'll bet they borrowed power from the outlet circuit for the light.
It's possible the switch may have been ok. Did the old switch use the 'back stabs' instead of the screws?
It may have been a bad connection.
Always use the screws....
Could I have hooked up the switch backwards and caused my own problem?
Absoltivly! It's the most common cause of 3-way & 4-way switch problems.
.... It usually go as follows:
Home owner: "I don't know, my lights just stopped working"
Me: "When did your husband change the switch?"
Home owner: "Oh.... How did you know he just changed the switch?"