Graph flicker on one PC, but not another

I am running LabVIEW 7.1.
I am using the basic state machine architecture, with an Idle state that updates a graph on the front panel. This approach has worked fine for months, but on one particular PC the graph flickers while it is updated in the Idle state. This IDENTICAL code run on a different PC does not exhibit the flicker. Any ideas? I've tried smoothing, turning off autoscale, etc. It flickers ONLY the graph on the whole screen.
Thanks.

Lets try a simple thing first.
Check if there are any overlapping front panel objects. For example if there is an object label very close to the left side of the graph AND that particular machine has a different system font setting (larger), it is possible that the label suddenly overlaps with the graph. This can cause performance problems redrawing the FP.
How different are the machine specs? Different OS? Have you tried upgrading the video driver?
LabVIEW Champion . Do more with less code and in less time .

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End If
One of this is should be different on the companies.
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