Have have seen this before, and Orion wasn't the problem. I opened a case with Cisco and this was a known bug with the 3750 IOS. I don't remember the version I was on but was close to 12.2(35). I never had the chance to upgrade the IOS to see if this resolved the issue.
Khalil - Looks like the upgrade to 12.2(58)SE2 didn't resolve the discards, or is the picture above from 12.2(35)? Also, you should make sure all stack members got the IOS upgrade.
Zak Kahl
Loop1 Systems
