Aironet 350 WAP + IP Scheme Change

Hello,
I have an Aironet 350 Wireless Access Point running VxWorks 11.07. We had it working fine on our 172.23.0.X IP address schema where the Ethernet and AP Radio shared the same IP address.
We have recently moved to a 10.121.40.X IP address schema and so I made very simple changes to the network configuration of the WAP (IP address, Subnet Mask, Default Gateway and DNS). However, now I can't get any devices to connect to the WAP even though I know they did before with the old IP address schema. I've even tried the WAP on DHCP and the result is the same.
What can I do to get this WAP working again? Is it something to do with the 10.121.40.X range?
Thanks.

The clients are trying to connect but in Windows don't get to the 'Acquiring network address' stage.
After a failed connection attempt the VxWorks 'Associations' page lists the client device but the 'State' is 'UnAuth'.
The WAP Event Log shows a lot of the following type of entries but nothing else:
00:07:57 (Info): Deauthentication from [10.121.41.19]0012f0dc17ca, reason "Unspecified Error"
00:07:57 (Info): Station [10.121.41.19]0012f0dc17ca Authenticated
00:07:56 (Info): Deauthentication from [10.121.41.19]0012f0dc17ca, reason "Unspecified Error"
00:07:56 (Info): Station [10.121.41.19]0012f0dc17ca Authenticated
00:07:55 (Info): Deauthentication from [10.121.41.19]0012f0dc17ca, reason "Unspecified Error"
00:07:54 (Info): Station [10.121.41.19]0012f0dc17ca Authenticated

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