No breakpoints are loaded for an Omega subtheme

I have also encountered this issue with my omega 7.x-4.0-beta1 subtheme.
I had to manually insert breakpoints on this page: admin/config/media/breakpoints,
than group them on this page: admin/config/media/breakpoints/groups/add
to be able to use those breakpoints with picture module

#1 What version of omega are you using?

I appear to be having a similar issue, the omega parent them I am using is (Omega 7.x-3.1).

The lines in my .info file are:

breakpoints[fluid] = (min-width: 0px)
breakpoints[narrow] = (min-width: 740px)
breakpoints[normal] = (min-width: 980px)
breakpoints[wide] = (min-width: 1220px)

Can you try the following:
1/ use the dev version if you're not already doing so
2/ install the devel module and go to /devel/php
3/ execute breakpoints_themes_enabled(array('my_theme'));
4/ if that doesn't work execute dpm(list_themes()); and see if your theme is listed and underneatch you should see a key 'info' and your breakpoints.

PS: This is not critical, but I understand the annoyance.

Second command returned a nice array:
dpm(list_themes());

My theme was lsited, and insidethe info I can see my custom breakpoints there. Sadly though they still do not appear on the admin page (/admin/config/media/breakpoints).

double check: you replace my_theme with the name of your theme?

Ahah, excellent, thanks, that imported the breakpoints fine for me and they now appear to be available.

I added a new button on each theme settings page 'Scan this theme for breakpoints' so you can manually import the breakpoints defined in a theme .info.

Where exactly did you add this button? I can't seem to find it.

I did however manage to have the breakpoints added using the php code.

The button is on each theme settings page, next to the save button, you might need to clear the cache after downloading the latest code.