Sorry for posting so many bugs, but I keep finding them. That really means I am continuing to use it - MathStudio really is a pretty amazing tool. Lots of bugs though. Maybe the macOS version just doesn't get as much attention as the mobile versions.
So anyway, both
Int(1/x) evaluate to
ln(x), when it should be
ln(abs(x)). I know, it is kind of a special case, but it would be nice if it were correct.