The 'save as' dialog in swiftfox-amd 18.104.22.168-1 (http://tinyurl.com/pzpul), when expanded to look for a new location produces this error: http://xs106.xs.to/xs106/06386/saveas.png
Navgiating back once on the top navigation buttons fixes this error.
And?.. How this could be related to the WM?
Created attachment 806
BTW, it works just fine here. Sounds like a bug in gtk+ or in swiftfox maybe?
I'm resolving this bug report as invalid since this is not related to xfce nor its window manager, it's a bug either in gtk+ or in swiftfox.