Late 2013 13" MBP - only left USB port can charge iPad 3

Hello,
My new late 2013 13" Retina MacBook Pro can only charge my iPad 3 (30-pin connector) from the left-hand USB port. Using the right-hand port, USB connectivity works but the "Not charging" message appears.
Also, with some USB cables the iPad continuously connects and disconnects from the MBP causing havoc in iTunes and a continuous chime from the iPad. This happens on both ports.
I'm wondering if the MBP has a minor electrical fault. Please could anyone with a late 2013 13" rMBP confirm whether they can charge an iPad via the right-hand port, using the old-style 30-pin connector? (I don't get the problem with Lightening devices.) If it makes a difference, my MBP is built to order with the i7 processor rather than the usual i5.
Cheers

OK, I messed around with this issue over the weekend. Here's what I did:
1. Used iPad 3 until I have run battery down to about 50%
2. Plug in to left USB port on Late 2013 rMBP. Battery icon starts displaying "flip-flop" behavior.
3. Replug into right side USB....no problem, all behaving well.
4. Tried plugging in my iPhone 4s into same cable on left USB port, no problem.
5. Replug iPhone into right side USB....again no problem, all behaving well.
Here's where it got interesting:
6. Exchange charging cable for a newer cable with the smaller-sized 30-pin dock connector.
7. Plug iPad into left USB port...and viola! Battery charging icon is steady...no "flip-flop"!
8. Replug into right side USB....no problem there either, all seems normal.
I have no idea what's going on, but this seemed to have solved prolem. BTW, the older cable, when plugged into wall charger, charges the iPad just fine.
Hope this helps someone else with this problem.

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