I think i've found some "bugs" or "annoying things"
my old file (6.1) for toolbar's button is no longer compatible, i had to add an icon (you've added one button) ok, not a bug
with the same mirc.ini config file, i look some differences between the two mirc
check those pictures
you can see that under the "menu", on 6.17 i have a double border, and on 6.2, a single one.
and between the toolbar and the switchbar, i don't have any border
the switchbar, is not as cust0miz4ble as on the mirc version 6.17
on the old one, we could use height and width for the switchbar's buttons. and i have the result of the screenshot, the buttons are sized depend of the text.
on 6.2, i can only set size to "small" and i get those huge buttons which do not fit to the text inside
i think this was the last one, so,