Stacklift gets disabled by turning the calculator off and back on. For example, 2 Enter 3 x results in 6. After turning the calculator off an back on the 6 is still there. Another calculation, for example 3 Enter 5 * then results in 15. But roll down doesn't get the 6 back as expected.
I am not sure if the problem is still present in the latest revision (sorry, I can't flash since I am on holiday).
Cheers,
Harald