[eluser]Unknown[/eluser]
You will not beleive me, y had the same problem and y changed the order of configuration parameters with the maintain_ratio = true, and it worked :S
I needed to adjust to height:
Didn't work:
$config['width'] = 126;
$config['height'] = 84;
$config['maintain_ratio'] = TRUE;
Worked!
$config['height'] = 84;
$config['width'] = 126;
$config['maintain_ratio'] = TRUE;
Some years later, but it may help someone...