Hoping someone can help.
My Nexus 7 will only charge if I power the device down, it won't charge when the tablet is on. I had this problem awhile ago with android version 4.2.2, and the issue was fixed when the 4.2.3 update was installed. Now I'm running 4.3, it worked fine for awhile, but now I'm having the charging issue again.
While on 4.2.3, I rooted the tablet but was running the stock ROM. Now with the 4.3 update, it is no longer rooted (though it does show the unlock symbol when booting up). I ran root checker which comfirms it is no longer rooted, and I'm fine with that.
Another odd problem, I downloaded Nexus Media Importer from the play store, it too worked fine for awhile. But when the charging problem reared it's head, that too stopped seeing a flash drive with my OTG cable. I was able to work around that by disabling auto screen rotation, setting screen lock to none, then powering down with the OTG cable/flash drive plugged in, and powering back up, again with the OTG cable/flash drive plugged in. I was then able to read the flash drive.
I thought I'd try to re-root the tablet, by my computer won't see it, nor will the tablet give any indication that it's connected to my PC.