(re: Gabriel Knight 1) I found the problem! It was a speed problem, but ironically the game was running too slow and not too fast.
I found this at Sierra’s KnowledgeBase:
Lockup at beginning of chapter 5
Turn the Speed slider control (located in the control panel) all the way up prior to the end of Day 4. The Speed control is unavailable during the ending sequence of Day 4 and the beginning of Day 5, so it may be necessary to restore to a previous save game to do this.
Note: Move the control towards the right to turn it up and to the left to turn it down.”
It worked like a charm! Thanks, Sierra, for still having tips around about the older games also.