Thanks for the quick reply - that indeed solves the problem!
MarkII
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The problem was caused by a spurious IOResourceMatch key in the dext IOKitPersonalities, left over from the initial Xcode project template. After deleting the key all seems ok (as you would expect!).
The entire entitlements application system appears to be broken. I applied for entitlements 8 months ago. After six months they were granted, but the settings on my developer account were incorrectly configured and they can only be partially used. Follow-ups to the grant request by email are seemingly ignored and neither DTS nor general developer support appear to be able to help.
This is an appalling situation: I have customers waiting to release software and we can not simply because of Apple's non-functional internal procedures. Had we decided to stick with kexts we would at least be able to ship.
Is there some way that these problems can be escalated to senior management, and adequate resource be put in place to avoid this disaster?
Ok thanks - we will confirm this when the final 11.3 release is ready!