portfolio stuck and never finishes loading

When I try to display a saved portfolio, I get a grayed over list with a set of spinning arrows and a message saying "Please wait a moment".

This status never changes and I cannot access any of the page functionality.  I have literally left the webpage 'spinning' for a few hours and it has never "finished" updating the webpage.  It happens using Chrome and Firefox, and has only started behaving this way in the last week or two.  I have tried resetting all the site cookies, logging out and back in, to no avail. 

Please fix this.  I can see the portfolio prices updating under the gray cover, so what exactly am I waiting for?  Just remove the gray cover and let me use the page while 'whatever' is happening behind the scenes.  It's really annoying to be blocked from using a "free" function which has worked for over a decade in the past.  Why did you "improve" it?  Sheesh.

HINT to SA developers.  Functionality is  more important than flashy, glitzy, crap.