Working with mathed in 2.3.1, I've noted a couple of small items.
1. Some primes need more space. Lowercase: t', d'; uppercase T', E', F'. (T' is the worst.) This is using the default Times New Roman at 150% zoom.
2. It seems much harder now to select a subscript with the mouse in an inline formula without selecting the symbol it is attached to, e.g. selecting 'i' with the mouse in $f_{i}$, particularly when there is another line of text in the same paragraph below the formula. This was always a bit fiddly but seems to be considerably more delicate now.
Andrew --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus