Yes, .oms is the optimized file that will play in the scheduler. However, the sequence file can be pulled into the scheduler also. When this is done the scheduler will optimize it. So, that is what fixed the issue.
It could be that folks who develop in V2 will not have this issue. I developed all my seq. In V1.8 and LSP V2 does some sort of conversion to them when they load.
This is just a guess about what might be happening.