[KPhotoAlbum] openSuseLeao 42.2, kde5: gimp tool tips missing if startet from kphotoalbum

[Reimar Imhof]

Hi,

when starting gimp from kphotoalbum (context menu, start external program...) 
gimp does just show empty tool tips.
There is no problem when gimp is started directly.
There is also no problem when gimp is started from digicam.

System is openSuseLeap 42.2, kde 5, qt 5.6.1.
kphotoalbum is 5.1

Cheers,
Reimar