Thank you for your friendly help. It seems to be working. I'm especially glad that I managed to revive my old savegame with the youtube let's-play. Somehow Nvidia automatically keeps updating to 382.05, yet it runs without issue.
This time I unzipped a working steam edition, copied it to c:\games\lsh3\sh3, applied the SFSF steam fix, installed LSH3 v15, ran JSGME and HSIE Option selector. I am running SH3.exe in Win XP SP 2 compatibility mode, as Administrator and with the DPI Optimization turned off.
I have no clue why it works now and not before. It seems to me that several things should still cause issues, yet it works. I have a feeling that the SFSF steam fix had a major impact, but I don't know for sure.
Anyway, I'm back in business and hopefully I can upload new episodes soon onto my channel (
https://www.youtube.com/channel/UC-5...YI7O9L4qLzg2Yw )
Thanks again THEBERBSTER for your kind support.