Hello,
I tried to replicate the issue that you are experiencing but unfortunately I was not able to experience the same behavior that you are seeing. One option is that you can use Diadem to generate the time channel. If that does not work out, you can place a small example of how you are creating your .lvm file and I will try to replicate your issue.
I hope this information is helpful.
Regards,
Kevin Leonard
Applications Engineer
National Instruments