I also have this issue. I have several browser windows minimized to the dock, but when I double-click a desktop icon on any of my spaces or right-click and choose new browser, I get the blank window. If I choose a new browser pointing to Home, I get a good window. If I restore a minimized window and then try to create a new browser by clicking a desktop icon or right-clicking New Window on the dock, I get a good window.
I have this problem too: blank windows without apparent reason.
At may 5-10% of New Browser actions (double-click or otherwise) the new window
shows up blank, and every follow-up New Browser action also produces a blank
window. Only a restart fixes this issue, only to appear at some other time.
I deleted the com.cocoatech.PathFinder.plist file as recommended, but this
did not resolve the problem.
Other observations: when problem occurs other PathFInder windows such as
About and Preferences seem to operate normally. Also some icons in the toolbar
of the otherwise blank window are active, e.g., Open Terminal produces a terminal
window in the correct directory.
PathFinder version 8.0.4 (1875)
MacOS version 10.13.6