0.64 x64 bug with switching mode selection

[typhoon71]

windows 7 x64, xnview mp 0.64
switch mode selection for double click doesn't work, if you change the default to something else in the dropdown menu and hit save it, it doesn't actually change but remains the same, as one can see reopening the setting window.
the other 2 options do retain the setting, just the doubleclick is affected.

[xnview]

yes known issue

[typhoon71]

Well, in a way it's a good thing that's a known issue.
This means it'll get fixed soon or later, so thanks in advance.