Hi,
this is 'funny' and possibly very low on anyones priority list... but.
I have disabled RSS feeds that used to show on dashboard, cleared them off in the Advanced Config (I don't mind looking at the feeds as admin, but I'd rather have my users of UCP have different feeds on, like from our ticket system maybe; whereas as admin I don't need /that/ in the dashboard, I'd rather keep it with 'official' freepbx feeds; I /do/ understand it's way too far in the cycle to introduce this kind of change; I'm fine with that - but then I have to clear the RSS feed settings and that's it.).
Anyway, the above is not the point I'm after....
The point is now, I have now 3 widgets on dashboard remaining.
No matter what I do I can NOT move them about to be like:
[FreePBX Statistics] [Uptime]
[System Overview]
(so, system overview UNDER the statistics and justified to the left, and uptime on the right)
System overview ALWAYS moves itself from under Statistics to land under Uptime.
With RSS feeds widget on, the grouping I'm after was totally possible.
FreePBX 12.0.76.2,
MBoFirefox 41, on 1280x1024 19" monitor 
under Debian Wheezy+Backports (up-to-date)
The behavior persists and gets even 'funnier' when window is maximized (either system overview or the statistics widget is moved, they just don't want to stay in the same column of the screen, they always rearrange each other. Hell man, who's the admin here, I want them my way )