When you have one virtual machine in the Virtual Machine List, do you also have only one virtual machine in your ~/Documents/Parallels folder?
Check your config.pvs file in the .pvm. It should contain one <NetworkAdapter> that looks like this:
Code:
<NetworkAdapter>
<Index>0</Index>
<Enabled>1</Enabled>
<Connected>1</Connected>
<EmulatedType>1</EmulatedType>
<SystemName></SystemName>
<UserFriendlyName></UserFriendlyName>
<Remote>0</Remote>
<AdapterNumber>-1</AdapterNumber>
<AdapterName>Default Adapter</AdapterName>
<MAC>001C429C45DD</MAC>
<Router>0</Router>
<DHCPUseHostMac>0</DHCPUseHostMac>
<ForceHostMacAddress>0</ForceHostMacAddress>
<VirtualNetworkID></VirtualNetworkID>
<StaticAddress>0</StaticAddress>
<PktFilter>
<PreventPromisc>1</PreventPromisc>
<PreventMacSpoof>1</PreventMacSpoof>
<PreventIpSpoof>1</PreventIpSpoof>
</PktFilter>
<AutoApply>0</AutoApply>
<ConfigureWithDhcp>0</ConfigureWithDhcp>
<DefaultGateway></DefaultGateway>
<DeviceDescription></DeviceDescription>
</NetworkAdapter>
Note that there should be only one <MAC> in the entire file.