I believe you. That's very odd, though. I have tested Overdose on original (2004) version from Steam. And had no issues. Sorry to say, I don't have any suggestions to help with your issue. Do you have the original (2004) GOG release to try where you're at? That's the only thing I can think of to do. I've heard the GOG version has helped others who had issues with the Steam version.
ParallaxTiger
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