USB-Hub not working on LEFT USB port?

Hello,
I have installed Windows 7 Ultimate 64 Bit on my MacBook Pro 13" Retina (Early 2013) and it's running fine. Boot Camp version: 5.0.5033.
But I have one problem: I bought an external monitor (Dell U2414H) which has an built-in 4-Port USB 3.0 hub. So I connect the Dell monitor using a DisplayPort 1.2a cable and an USB 3.0 cable. But Windows only recognizes the monitor's built-in USB hub when I plug the USB cable into the right USB port (when I sit in front of the MacBook). Then it works without problems. But when I plug the USB cable into the left USB port of the MacBook Windows only says "USB device not recognized". But other devices like USB sticks and USB drives also work without problems on left and right USB port of the MacBook. Also when I boot in OS 10.9 Mavericks the monitor's USB hub is working on both USB ports of the MacBook. So I think it isn't a hardware failure. I also re-installed Windows, but I have still the same problem.
Do you have any idea, why only the monitor's built-in USB hub is not working in Windows on the left port of the MBP or even how I could fix it?
Is Boot Camp 5.0.5033 the most current version? I checked the box to download the latest Windows support software and also didn't find anything newer than 5.0.5033 to download, but sometimes I read about 5.1.1 - but where could I download it? AND: Doest it help?
Thanks in advance!

I think I've hit a variation on the problem you're enoucntering. I have a late-2013 13-inch Macbook Pro Retina. I've just installed Boot Camp and a copy of Windows 7 Pro. This is my first experience with Boot Camp and Windows on a Mac, so I'm in foreign teritory.
The install all went fine and Windows 7 booted up fine and so far, all hardware seems to be working as expected, with one exception. Things went sideways when I tried use it in "clamshell" mode - lid closed with external monitors and all my peripherals attached to a USB hub. I set up Boot Camp to boot into Windows and attempted to boot. It would give me the usual boot-up fanfair and a then a gray screen for a few seconds, and then it would reboot. It just rebooted over and over. I eventually discovered the issue was the USB hub - without the hub connected , it would boot just fine. Once it was booted into Windows, I could attach the the hub and everything would be recognized normally. Furthermore, I could put the system in sleep mode, wake it up and everything would be working fine. But it simply refuses to boot the USB hub attached. I've stumbled on a couple related threads - see https://discussions.apple.com/message/23802231#23802231. The suggestion is that only certain hubs to not work. I've got two different high quality powered hubs and both display the same behaviour. The other point is, that when booting into OS X with the same hub, it works perfectly. So it's a strange problem.
Note that after reading your post, I did try the hub in both right and left USB ports and that made no difference in my case. I do have one more hub to try (built into my Dell monitor). I'll report back if that happens to work.

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