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Hi, We have found serious bug while performing two RTAG operations in parallel. The problem was that changes of first RTAG operations where removed by second RTAG operation. The problem comes from using not locked file, original source code in function rcsbuf_open() opens the file before locking the file. The scenario is as follows: 1) process 1 opens file and locks file 2) process 2 opens file 3) process 1 modifies file, unlocks an closes file 4) process 2 locks file and modifies file overwriting modifications of first process because it has opened file before locking it! Please find attached out patch. Regards, Krzysztof Nowak