I have been solo camping regularly in the summer for about 2 years (2006-2008), me being a 5'1 tall asian wall-flower and all. Got a lot of warnings from locals and friends, but the only robbery I've experienced so far is from stray dogs.
I know this is mostly in Chinese so it might not help, but the local hikers use a BBS to alert each other about recent mountaineering accidents and robberies . From their postings and archives, I concurr that there has been a lot of muggings between 2004 and 2007, but it looks like things are under control again since 2008. From what I gathered, local hiker's greatest dangers are probably snakes (especially at night), fog/smog that might cause you to get lost or fall off a cliff, and finally, heat stroke.