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Hi Erin- > The attached IDV file depicts the comparison of two models during an > period of overlap. However, when the right-pane goes back to the first > time frame, the model in the right goes to the last time frame. Therefore, > one step is from 6/30 and the other 7/08. Is this a bug of some kind or > something in the script? I've attached a .xidv file and screen capture > for your review. This is the default behavior of the underlying VisAD subsystem. If there is no matching time in the other display, the index is set to the last in the series. I've noticed this with webcam images also. I'll look into catching this situation and if the new time is greater than the set of times, I'll set it to the last frame, if it's less than the set of times, I'll set it to the first in the sequence. Does that sound like what you want? Don Murray Ticket Details =================== Ticket ID: KRH-459185 Department: Support IDV Priority: Normal Status: Open