Well, 2 years almost to the day it has happened again.
Checking over one of my bows I noticed one of the mods is starting to split right on the rounded corner just like the pics in tthis thread;

These are the later 2010 mods, the two bows I have with the earlier mods are Ok.
Comparing the mods, the earlier ones do have a little more metel on that side.

Guess I'll have to call Martin this week and see if they still have mods in stock.
I believe the Nitro mods are the same so fingers crossed.