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These are photos of our recently installed MGS system over curb (Figure 1).  The plans detailed a 16-d nail into each blockout that apparently wasn't installed. 

Had heavy snowfalls all season in this area (and all of Iowa for that matter).  Trying to figure out why these blockouts are tipped in this direction, but we're thinking it may be related to snow-removal operations.

My question of the day boils down to repairing this installation. You can see on some of these blockouts, the flange of the post has fractured off portions of the routed channel in the back side of the blockout. Any opinion as to how much of this channel would need to be intact to reuse the blockouts (basically straightening the blockout and placing the nail)?

We agree that this blockout rotation would appear to be caused by snow removal operations. To resolve your blockout issue and eliminate the requirement to field drill holes in the steel flanges, we recommend that you place four (4) nails in the top and bottom corners on both sides and bend the nails over the flanges. The four nails should provide adequate resistance to block rotation, even under snow removal operations. For this solution, you could use 16-d nails, but it may be preferred to use 20-d nails with this alternative. Please note that it would not be necessary to have the post webs on the back of the blockout using this option.