Linux bonding issues on stacked 6248

Have setup 4 Linux hosts with several bonded pairs spanning between two stacked PowerConnect 6248s and I seem to be having issues with packet loss.  I have configured the majority of the bonded NIC pairs with alb (advanced load balancing) mode and a few with an active/backup.  The active/backup pairs work with no issues.  I can disconnect the active and the secondary kicks on.  The alb pairs seem to allow some traffic through but not all.  I have VM traffic running across the alb pairs and the virtual hosts are showing dropped packets but none of the other interfaces involved seem to be recording any dropped packets.  I have another non virtualized host that is connected to the switch with a bonded alb pair and it is also not showing dropped packets but is experiencing the same issue.  I have set the switch to use portfast for the links as I was thinking that there could be an issue with spanning-tree causing a problem but that was not the case.  I also disabled loop guard on those interfaces as well.  I am kind of at a loss and was hoping that some of you might have some ideas as to what the problem is.

Thanks in advance,

Nate