Calibri seems to be the only font this problem has been reported at. Until the new release, one work-around could be switching to a different font. For example, Verdana seems to be pretty similar in appearance, as long as you drop down your font size slightly.
Actually, the bug with
https://forums.mirc.com/ubbthreads.php?ubb=showflat&Number=202284 is what's causing the urgency for a sooner-rather-than-later updated version release.
