685 - Folder size not shown when in root of UNC path

[catdroid1]

I can't see folder sizes when I'm in a root of unc path (\\server\c$) by pressing Spacebar (right pane).
If we go deeper, folder sizes can be shown.
In statusbar we can still see folder size ("Test" folder, 9 bytes, right pane).
Folder size in root of local disk C is shown correctly (left pane).

FreeCommander XE 2015 Build 685 32-bit public, Windows 7 SP1 64-bit

[ralfso]

Folder size has to be calculated by FC, so maybe it takes a longer time to calculate the size of this root folder over network.