Signing error -1027

I am getting a signing error

ISDEV : error -1027: Failed signing regid.2012-08.com.luminexcorp,swrandd_B87E3AAA-B94F-4A8B-B28B-E6F5160162E8.swidtag

building with SAB but I have no such failure building with the IDE. Is there an update or am I missing something?

Thanks,
Dave