I built a stack of four MS355s today. I mounted and cabled them based on the order of their serial numbers. This turned out (not surprisingly) to be the same order as the MAC addresses. After I built the stack, the Switch Stack Overview page showed them in the reverse order. I opened up a ticket and was advised that there's no way to change this, but that renaming the switches (from the MAC address) should be done anyways. Later, after renaming the switches, they did end up showing up in the correct order in the Overview page. So, I wonder if they are sorted the wrong way only when they do not have a name set. The IP address order is currently the same as serial/MAC/physical order, and it was almost certainly the same when I created the stack; so I don't think that the IP address plays a role.
In any case, it would improve the deployment experience if this could be fixed or at least answered by a KB.
I also noticed that blinking the switches didn't work for one of the four switches. This was only tested when they were in a stack.