I made the PGN output "more" standard compliant using SAN and a few other changes. I now also annotate each move with search depth, score, expected reply if a principal variation is available, and the taken time in seconds. I am using my own annotation format to avoid misinterpretation in other chess programs (as could be seen in the previous Arena screenshot), but the format can easily change if required. A sample game between the built-in engine and stockfish is shown below (as can be seen, the forum formatter fully accepts the PGN output).
