Does switching between PPPoE and DHCP cause complications?

I've been trying to help a colleague with a MacBook Pro sort out wireless networking issues. At her desk, she connects by Ethernet to her DSL modem, which uses PPPoE. When roaming her office she uses a Linksys Wireless N modem, which serves up IP addresses via DHCP (and is connected to a second modem elsewhere on the premises). There seems to be no simple way of switching between the wireless and the wired connection: when I unplug the Ethernet cable, even though there's a wireless signal, there's no Internet connectivity. And when I plug the Ethernet back in, I have to go into System Preferences and reselect Ethernet manually and confirm all the settings before it'll connect. I tried creating locations but this didn't seem to have any effect.
I'm reading a lot of posts that suggest the MacBook Pros have wireless networking difficulties. Is this an inherent problem, then, that we're dealing with or might it have to do with the conflicting protocols?
Any insights would be much appreciated.

As third party 802.11n routers are still using a draft standard, you may run into issues with them if their firmware isn't up to date. See my WiFi FAQ (x) for potential solutions.
(x) Links to my pages may give me compensation.

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