I've bought an USB-to-ethernet-adapter and a minidisplay-port-to-VGA-adapter. But I can't use them at same time. At first, I plugged those two adapters and only the USB-to-ethernet worked. Tried restarting the mac then only VGA adapter worked.

I've bought an USB-to-ethernet-adapter and a minidisplay-port-to-VGA-adapter. But I can't use them at the same time. At first, I plugged those two adapters and only the USB-to-ethernet worked. I tried restarting the mac then only the VGA-adapter worked. I also tried to reinstall the OS.
I'm using new 13-inch MacBook Air early 2015. OS X 10.10.3.

Thanks Malcolm - Do you think it might be worth trying to flash the firmware on these cases - there seem to be updaters available on Prolific's website. Obviously I'd have to do it on a PC. I've emailed Prolific asking them about my problem. No reply as yet, and I'm not holding my breath! Do you know if there are any other posts on these boards relating to Prolific? Stupid question really - I'll just do a search...
Thanks again for your post. Cheers from Bonnie Scotland.

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