This helped Stefi, but it was due to her server settings. Not sure if it is going to help you.
in
ow_plugins/fbconnect/bol/service.php
line 164:
replace this line:
$out[$field] = "
http://graph.facebook.com/{$fbUserId}/picture?type=large";
with this one:
$out[$field] = "
http://graph.facebook.com/{$fbUserId}/picture?type=large&?return_ssl_resources=0&redirect=false";
in the same file
line 167:
replace this line:
$out[$field] = "
http://graph.facebook.com/{$fbUserId}/picture?type=large";
with this one:
$out[$field] = "
http://graph.facebook.com/{$fbUserId}/picture?type=large&return_ssl_resources=0&redirect=false";
in this file:
ow_plugins/fbconnect/classes/converters.php
line 99
replace this line:
$imageContent = file_get_contents($value);
with this lines:
$imageDataStr = file_get_contents($value);
$imageData = json_decode($imageDataStr, true);
$imageUrl = $imageData["data"]["url"];
$imageContent = file_get_contents($imageUrl);
This should work, but remember you changes, if it does not work for you, please revert the changes.