When I select a marker and edit its name, the decimal number of its time position is set to 0.
For example: if a marker is positioned at 7.50s, when I edit its name, its position becomes 7.00s. If it 6.33s, it becomes 6.00s.
I believe this is probably due to an i18n issue where you're locale parses the decimal point as comma instead of period and so atof is ignoring the rest of the number when it sees '.' (an invalid char in your locale).
I think that's been fixed in a later version by working around the issue and letting '.' be the decimal point regardless of the locale. (not as NLS friendly, but works nonetheless)