Can you give us more details about your setup?

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Currently, we have Amazing Charts 6.1.2 installed on a central server running Server 2k3 SBS. We have about a dozen machines (75% Windows 7 laptops, 25% XP desktops) connecting up, all with 6.1.2 installed as well.

Do you have wired connections? Are your laptops wireless? Are you using a gigabit switch? etc. When did this start?