I have been unable to add any instances I have created in TurnKey Hub to an Amazon Elastic Load Balancer.  When I have tried, I get the error "InvalidInstance: undefined" on the last screen of the ELB creation wizard.

Googling and searching Amazon's forums indicate this error is often caused by a mismatch in bit architecture between AMI and instance type.  The error also happens when attempting to load balance instances that were launched using a paid AMI.

I have tried to add LAMP and Ruby on Rails appliances, in all instance sizes available on TurnKey Hub, to an Elastic Load Balancer without any success.

Any ideas?