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