I decided to uninstall the game again and upon completion of this, cleaned the registry and shut down the pc completely. For the other reinstall efforts, I only did a restart, not shut down.
Reinstalled SH4 from original disc (not gold version.) Then I did something I did not do before. I installed the old patches "silent_hunter_4_1_1" "silent_hunter_4_1_2" "silent_hunter_4_1_3" and "silent_hunter_4_1_4" before I installed U-boat add-on from the original disc.
Now everything is working as before. Either it was the cold boot before installing or the installing the patches before installing U-Boat add-on or a combination of both, fixed the problem.
thank you for your time
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