[CONFIRMED] Font script changing when editing subtitles

[theofer]

Suddenly, after months of use, the subtitle editor start showing Gibberish signs instead of Hebrew (and maybe other unicode languages?) while editing. None-touched subs displays correctly, and even when I delete whole lines there's no problem, only when modifying inline Hebrew text. With English subs, everything is alright.
The font script set correctly to Hebrew. As advised elsewhere, I removed the Windows update KB943460, but with no use.
I'm using XP SP2, and BS Pro 2.26.956 (updated recently from 2.23.953).
Added below a before and after picture.



Thanks ahead.