Hi,
Using the newest beta and encountered two bugs so far:
When I go into tone mapping and create new overlay (let's say a gradient), the tone mappping controls are greyed out. However, you can still tick/untick the controls and use the sliders (however they don't work).
And the second one - some time ago I posted that dodge and burn brushes don't work as intended. They didn't take into account the lightness of the area when choosing shadows/middletones/highlights, instead the effect was applied more or less (but the entire brush area was affected - everything just gets lighter or darker depending on the option you choose). It was fixed in a previous release, but I think it's back in the current beta.