Error "not possible to add a collection" with digiKam 5.7.0 in Win7-64

[Hans Schmidts (WEB)]

I installed "digiKam-5.7.0-02-Win64.exe", then selected some empty dir 
on drive D: for database, then a dir with 2 sub dirs with *.jpg as 
collection via "Add collection". After closing "Configure digiKam" i get 
error message "It was not possible to add a collection for the following 
paths:" (showing the correct path on D:). After re-opening "Configure 
digiKam" I see wrong path on B: (see screenshots). I have access right 
in all that folders, and in the parallel database dir I see 
"digikam4.db" etc. successfully created.
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