IDE 1.6.5 fails to upload to Nano: 'can't open device'

Development Tools IDE 1.x
1

Hello All,

I have just upgraded from 1.0.5 to 1.6.5 and discovered a bug on Mac OS X (10.9.5). Here is the console:

avrdude: Version 6.0.1, compiled on Apr 14 2015 at 16:30:25
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2009 Joerg Wunsch

System wide configuration file is "/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf"
User configuration file is "/Users/markusloeffler/.avrduderc"
User configuration file does not exist or is not a regular file, skipping

Using Port : /dev/cu.wch
Using Programmer : arduino
avrdude: ser_open(): can't open device "/dev/cu.wch": No such file or directory
ioctl("TIOCMGET"): Inappropriate ioctl for device

avrdude done. Thank you.

The problem seems that the port name is NOT '/dev/cu.wch' but actually ‘/dev/cu.wch ch341 USB=>RS232 1d10’. (this is a Nano compatible board)
It seems that a space in the port string breaks the arguments to avrdude

Any suggestions?
Markus