Hooper is exactly correct. Only except that I use IE 11.
He's exactly correct that the last watered date on the opening screen using IE11 is not initially correct. My learning here is that now I'm including the word 'initially.' I didn't realize that IE's running time is so slow that it takes minutes for some values to be stated correctly.
It perplexes me why it's a struggle with IE as the browser for Rachio. Complex applications are increasingly going 'the cloud route.' Autodesk, Word, Excel and Powerpoint, just to name a few, all work fine with IE.
Thanks for the answers above. I now know what the problem is (difficulties programming for performance when IE is the browser).