FreeCommander XE 2016 Build 726 64-bit donor, Windows 10 Pro 64-bit
The step(s) to reproduce the bug are:
1) Open freecommander being placed on the same folder/disk on both panels (for example "OS C:", like below)
As you can see in the image, one panel (right one for me) doesn't show folder sizes within the "Size Auto" column.
I can't find the way to solve it.