Seen this problem at least 20 times in this forum, and none of the solutions worked. Tried getting FTDI drivers, reinstalling Arduino IDE, switching FTDI cables, getting an FTDI adapter.
Just completely frustrated at this point that the guys at Arduino don't have a guide that allows us to use them. Most likely will be moving to another platform if I can't solve this.
Using Arduino Pro Mini, 5V 16Mhz. On a Macbook Pro running Yosemite. I click upload on the Arduino IDE, and I get the standard avrdude sync error. Obviously a DTR/RTS issue where the line is not being pulled low. And yes, I know that the drivers on Apple supplies on Yosemite are not enough, so I got the FTDI drivers separately after removing the Apple drivers.
I really hope you guys can solve this...