[scribus] window problem after changing workspace in cinnamon linux mint 18.3

[Peter Roosenboom]

I'm working with scribus 1.5.4 and 1.5.5svn.

I use Scribus under linux mint 18.03 cinnamon 64b. I work with four 
workspaces.

There is a problem with specific opened windows after having moved to an 
other workspace and back.

When I open a window like preferences that ends with a choice for ok or 
abort and I leave this window open and then when I have moved to another 
window and back to scribus, I cannot click to OK or abort anymore. And 
every click in this windows seems to be some centimeters lower than the 
target option. Other windows like scratchbook function normally.

I notice this behaviour on more than one computer, always with linux 
mint cinnamon since I started DTP one year ago.

Peter