PC 1 Installed 10074 on a virtual machine and could access all network shares without any problems straight out of the box.
PC 2 dual boot installed on PC hard drive. Installed all updates, and couldn't access any share on the network. I could however see the Win 10 machine from other PCs on the network. Reinstalled Win 10 Preview 10074 without any of the updates and I can
now access all network shares.
I am uncertain which one would have caused the issue. But fresh install without updates has fixed the issue for me.
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