Swab, don't just swap the bytes in the GBT target.
diff --git a/cgminer.c b/cgminer.c
index 5058331..201ab2b 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -1569,7 +1569,7 @@ static bool gbt_decode(struct pool *pool, json_t *res_val)
swap256(pool->previousblockhash, hash_swap);
hex2bin(hash_swap, target, 32);
- swap256(pool->gbt_target, hash_swap);
+ swab256(pool->gbt_target, hash_swap);
pool->gbt_expires = expires;
pool->gbt_version = htobe32(version);