SrtFix 1.1 has been posted. You can download using the link in the top post.
The "brain cramp" was that 1.0 assumed checking for periods in even numbered lines would work, when that just happened to be so because the particular subtitle file had all "one liner" subtitles.
Version 1.1 now checks each line for "-->" which indicates the subtitle time interval. On those lines if it finds a period '.' it will change it to a comma ','
to fix the milliseconds section of the time code.
That's all it does. But when you get an .srt that won't load it's easy not to notice those commas are really periods, unless you look closely.