Yeah the rounding stuff is also kind of funky when select part of a stack using the bar.
It will display in example 1/1, when you reach ~40%, but when you then release it doesn't pick anything up. You have to be at around 60% for it to take effect.
Same with bigger stacks, says 250/400, but you only get 249.
This made me thing the replication bug was back as I was selling the 249 and saw that I had 151 left, even though I thought I sold 250 XD
I agree on the UI stuff, being able to click on a bar to see more info would be more fluid then having to press F1.
I do really like how the UI is more context sensitive, showing only the things that are important at that time.
It is the honestly the first thing I noticed with a bit "NICE". And believe me, I think about all your hours of effort everytime I click a button ;P