This is the second time I’ve had this happen. The first was with my 2.3 installation, comment notification just stopped. I fixed it easily by deleting my email addresses and re-typing and saving. Then it happened again the other day on the same installation, this time my fix didn’t work, or any of the others mentioned in this thread. Today I upgraded to the latest version, and nothing has changed, tried all the fixes again to no avail. A great nuisance to say the least.
