I'm at a loss then. Although, I wouldn't trap myself into thinking the OS has any significance. The network layer doesn't care about the OS. If there is an IP conflict or incorrect netmask settings somewhere on the LAN, it's going to effect routing in unpredictable ways.
Try configuring all your clients manually and carefully select ip/netmask/route settings.
I can't help troubleshoot your setup beyond these suggestions without a detailed description of the LAN and how it is configured.
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