TotalSpaces will not switch to empty Space if full screen TotalFinder is active program

TotalSpaces 2.6.24
TotalFinder 1.10.10
OS X 10.13.5 (17F77)
Grid 4x4
Open TotalFinder expand to full screen
use overview grid or instant exposé
try to click on an empty Space
view will switch briefly, but immediately will switch back to full screen TotalFinder

No problems if TotalFinder is not full screen or if you click on a none empty Space or if TotalFinder was not the last active program