Interesting, I use it every day and haven't had the issue in years. Just getting lucky I guess.

gswitz,
I have issues when I reload a ProChannel preset that has Concrete Limiter in it. The left meter pegs and doesn't pass a signal. I even tried setting up a blank preset with nothing in it other than eq (turned off), load it and then load the preset with CL in it, same behaviour.

I guess I don't use PC Presets much on the main bus. I usually drag my Plugins from the browser into the Pro Channel. I just right click to add the CL.
 
The FX I pick on any given project are so varied and randomly picked. I just go rooting around in the arsenal for things that might fight the jam and start tweaking them.
 
I just went to try to repeat it and GOOD GOLLY THERE ARE A LOT OF PC PRESETS IN THERE! THANKS CRAIG!!
 
I should add, I totally believe you. If support says it's a bug, it must be. I wasn't able to repeat just now but... shrug.