Like this:
I'm assuming that this is an artifact of running on Linux under Wine - and that you don't have this problem?
The first 5 options under Portfolio(context)/Graph-as/"PieChart" have this problem. The "Investment Type" appears OK, but the data has only two investment types. "SubPortfolio" works.
When clicking on the field with any of the problem pies, the info-dialogs display correctly (with various likely data from the pie areas that do not display in different colors on the pie chart).
If in fact you don't see this problem, and you don't think of any data-related reason for it, could you ask the developers what .dll files or helper libraries they use to display the pie chart? Then I can go to the Wine people and ask about this problem more cogently.
Properly displaying pie charts are very important to the value of Fm for me.
Thanks
Rufus