My MacBook Pro does not connect wirelessly to new BT homeHub 5

I have been able to connect my iPad and iPhone to the new hub, but not my MacBook Pro. The wireless key password keeps being rejected as invalid, although it is correct. I have called both BT and Apple support and have tried options such as resetting the hub and restarting the laptop. The wireless connection is then sometimes picked up but drops after a few minutes.  Has anyone else had this happen to them and can offer any suggestions?

I agree with your diagnosis, but if this only started to happen after you messed with chaning the WEP encryption to WPA2, then something wasn't done correctly.  If you truly went in and deleted all the entries for the settings on the WIFI password from the keychain and then made sure your network settings are on Automatic and not personalized ones and then deleted all the network .plist preference files as I asked, then there's nothing left that could be causing this on the Mac short of a reconnection issue because it's WPS2/AES and 802.11n band with a specific radio in that WIFI router vs the radio that's on the Mac.
I've recently seen an issue that with some router chipsets, new iMacs had issues staying connected when the 2.4GHz band was set to n speeds.  This doesn't happen on all routers, but it happened with this particular model.  So, AS A TEST, you can try dropping the speed to b/g and see if the Mac automatically reconnects.  If it does, then bump it back up to b/g/n and change the encryption to both WPA/WPA2 instead of just locking it at WPA2/AES.  Then test again with a reboot/sleep/wake and see if it reconnects.  If it does, finally put it back to just WPA2/AES and if it really is a bug, it'll stop auto-reconnecting at this point.

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