I am trying to mine for testnet using the getblocktemplate RPC method, but every time a mined block is submitted I get an error that says the calculated merkle root is invalid (RPC_Result:bad-txnmrklroot). I am using version 2.5.0 (windows, x64), solo mining for normal bitcoin (so using sha256d). I have several such failed blocks in files, if it is helpful in debugging my problem I can send them to however wants to take a look.