We had this come up recently on Actinic V11. SagePay payments were going through OK but orders were going into Pending Payment Service Provider and an error like the one above kept coming up.
We checked the secret key and all the other settings but they were all correct. In the end we called SagePay and asked for a new secret key - in the process of doing this someone at SagePay said they had encountered this issue before and they had resolved it by copying the secret key and encryption password and pasting them in again at their end. They did this and it resolved the problem. Why, I don't know, but it worked! They said they would inform everyone at SagePay about this issue so with any luck they'll know what to do if anyone ever encounters this issue.
Hopefully this will help someone save a bit of time one day
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