The plumber found a blockage and cleared it, and the very good news is that he said it didn't 'feel' like tree roots.  With all of our trees here that is always a distinct possibility.  

So now I'm off to clean ALL three showers/tubs since the foul water backed up into all of them.  

I really had other plans for this afternoon (like mucking off my sewing area) but the squeaky wheel gets the grease... and the smelly bathrooms get cleaned!

BUT 

at least it happened today instead of tomorrow!!!!!!!!!!