Just had the same bug as ichbinsehselber. Loaded a game middle of floor 5 or 6, finished the floor, tried to descend, screen fades (mostly) to black and crashes.
If you're having trouble, you're probably handling research wrong. Because the cost of research goes up with each point, getting research points early actually makes the game MUCH harder later on. For the first two ages, ignore culture, focus on population and a bit of production. Try not to upgrade anything past level 1 unless necessary for population growth. As you get near the next age, you can save up some research points... holding points and spending them after the age changes is usually much better than spending them in the current age, unless you're against the population limit. When you enter the final age, you should have a few research points ready to go, and can focus on getting production up. Never upgrade religion (culture) past level 1 in any age.
 "Rogue Fable III"){kind=icon}
 "Pre-Civilization Bronze Age"){kind=icon}
 "Hippolyta"){kind=icon}
 "Next, Please!"){kind=icon}