Homegroup issue: Wired desktop / Wireless laptop

Both computers are running Win7 x64 Home and connected through a D-Link 604 router with no issue.

Both are part of the same workgroup and homegroup.

When the laptop is connected via ethernet, sharing between computers is not a problem.

When the laptop is connected via wireless, sharing is no longer possible, even though still connected to the homegroup. I've been unable to find what is preventing this.

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