I no longer am able to open two Solidworks windows what happened?
I run dual monitors and sometimes it is nice to run too two copies of Solidworks for editing properties, referencing documents ect...
I realize the second copy does not save a journal file but all the editing of actual files I do in the original window.
When you start the second instance, SW always feels obligated to warn you about its inability to save a journal file. I often have that dialog box appear behind another window. If that happens, it waits for user input indefinitely, giving the impression that SW has not started. Try using alt-tab to flip through your windows and see if the dialog box comes up.