I have been upgrading skills using the new feature. However, every time i do so it uses more gold than it says, i am not sure if its just continuously upgrading the skill till I am out of cash or simply using more gold than it says but either way thats about 12m gold I just lost…
Update
Its definitely an instance of continuously upgrading the skill, so at least the gold has been used and not vanished.
Screen shots follow for Joy selected to upgrade radiance by 30 levels, but as you can see it upgraded it 50 levels. The only reason it stopped at 50… no more gold! So the buy more gold pops up automatically…
Possibly linked to pulling the slider to the max and then back down again. (Confirmed not related to slider, just a bug across the board)