I put up a couple complaints on SeeClickFix back in late 2009, and left the most fixable one up, and it still hadn't been fixed in late 2012 when I moved away. What's the deal? SCF boasts that 125,000 issues have been fixed, but it seems like some issues get fixed, while other issues don't. Broken curbs in a working class neighborhood do not.
In the time I lived there, I saw residents fix the curbs twice - once was (probably illegal) modification to smooth over a cut so they could drive over it, and another to just have a curb. I don't recall seeing a City of LA crew fixing the sidewalks.
In contrast, reports of potholes to the City of LA's website were fixed in a week or two.