Build 444 solves most of my problems! Thanks for a great work.
The charts are wonderful!
I found there in pie chart a tile 'Legend title' which is ... by definition ... supposed to be editable. However I did not find where. Where it is?
In addition, numbers are exposed with $ before them (checkbox 'format as currency' is not checked).
The (stocked columns charts) series colors became the same and they are are represented as 'rainbow' in legend in this build (were OK in 437).