I'm b-a-a-a-c-k.
This time, I added the plant Heuchera 'Pinot Gris' to my list. I looked at my Heuchera list after the addition, but only went down alphabetically until the P's, and did not see it. I thought for some reason I messed up, so I added it again.
The second time I looked at the Heuchera list and still did not see it under the P's, I scrolled down to the end, where I saw it. (All of the other Heucheras were listed in the database without species, so were listed first; this is a villosa species so it was added at the end of the list.)
One problem, though, was that there were 2 entries - because I added it twice. (So Dave, I echo Sue's request that maybe there should be a warning that the plant was already added to the list?)
I deleted one of the two entries, then looked at my plant list summary (on the left hand side bar), to see how many plants tagged Heuchera I had. There should be 12 total now, but it shows as 13. (So I get the feeling that that sidebar list was not updated when the duplicate entry was removed.)