Adding/removing bridge member deconfigures interface?
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 I have bridge0 set up as lan, with opt1 an ath and opt2 an axe. So I create opt3, a run, and add it to the bridge. I am not presented with an "apply" button, instead, the network just goes away. I walk over to the router, and the status screen at console shows lan no longer has an IP. Reboot and it's fine. Today, I removed opt3 from the bridge. Hey, there went my IP address again! Sigh. i386, 2.0 BETA4 build from yesterday. 
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 You can open a ticket in redmine for this. 
 But for 2.0 that is the behviour expected.
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 It is probably this issue, which likely returned when you added true for the call to interface_bring_down again: http://redmine.pfsense.org/issues/775 
 The issue reported on http://redmine.pfsense.org/issues/867 is the same one. Both times were commits that were intended to fix PPP issues.This issue should be fixed again by that commit referenced on #867. The snapshot currently building will not have the fix, but the next one after that will. Maybe try a new one tomorrow. 
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 I wouldn't have guessed that, as there's no VLAN in play on this system. But I'll give it a try when the next snapshot drops.