I think I found a bug in the rack drawing code, specifically when using Advanced Dimensions. When I use Advanced Dimensions, and then later rename the rack, the rack loses all of the advanced dimensions and reverts to drawing using basic dimensions.
I was able to replicate it easily:
Start a new model, insert a rack. In the rack properties, go to Dimensions->Advanced Dimensions. Then for each bay, change the Level Location to 1. (We do not store on the floor in this system.) The rack will get taller since the first storage location is now elevated. Apply and close the properties.
Then, open the rack properties again. Change the name, and when you click Apply, the rack redraws itself to its original configuration, with the first storage location at level 0. And (of course!) Ctrl-Z doesn't work here either.
ETA I'm pretty sure that the same thing happens with changes besides re-naming.