IOS 4.2.1 Broke VPN

Any reason 4.2.1 would break our VPN connection?
Currently connecting to a SonicWall VPN using L2TP. Everything worked great on 3.2.2, but broke on 4.2.1. I have even downgraded and it works fine, but no go on 4.2.1

Yes it does get to the firewall:
IKE Responder: ESP encryption algorithm does not match
RECEIVED<<< ISAKMP OAK QM (InitCookie:0x259ef61e052e2f4d RespCookie:0x141170aedc8317ca, MsgID: 0xFDB1207D) *(HASH, SA, NON, ID, ID, NAT_OA, NAT_OA)
IKE Responder: ESP encryption algorithm does not match
IKE Responder: IPSec proposal does not match (Phase 2)

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    enosmac wrote:
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    vpn:Servers:com.apple.ppp.pptp:IPv4:OfferedRouteTypes = _empty_array
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