RW: can't view Source list again!

There have been times when the source list becomes hidden and I can’t see it anymore. This has been happening more lately. The code I had stored to fix this was:

defaults delete com.realmacsoftware.rapidweaver6 "NSSplitView Subview Frames Main Document SplitView"

I would put this in the Terminal and all was fixed again. However today even that code does not work! And, yes, I’ve restarted my computer.

Besides being a time waster, this is troubling that the behavior is becoming more common and that the code that used to fix it no longer does. Any suggestions for how to get View Source visible again?