OK - it sounds like the frame horn bolt strip from overtightening, and the subsequent pivoting of the slotted rail bolt points is it.
The stock parts are a bit delicate, and just like putting together IKEA furniture, if you use too much force, the stock parts can't take it, and can break, strip, warp, etc.
That's one of the reasons I didn't use the stock frame horn end bolt holes when I lifted my winch bumper, I welded an "L" on top of the horns, and bolted through that, and as the horns themselves were a bit wimpy, I also welded a brace between the horns to shore them up, especially against torque loading from potential off angle winch loads, etc.
Our confusion here is that articulation is important, even in conversation.
Saying something "broke" implies that it, well, broke.
If what was meant by "it broke" is that "What it's attached to broke", that's fine, its not like Cobain is famous for clarity of speech....hell, most of the time he gets kudo's for performing opposable thumb and forefinger tricks.
By process of elimination, and reliable eye witnesses, we figured out what he would have said had he been better at this sort of thing.
The morals here are:
To take the pics BEFORE travelling 2 hours away..
...and to take it easy on stock mounting points, they were not designed to take non-stock forces.

_________________________
- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif