Sub directory or www errors

[hlaporthein]

I have been using this plugins for ages. Thanks For that. I use aq_resize and it work fine for me. But, Today I got error in wordpress subfolder installation.
For example, suppose my site domain name is http://www.example.com.de and my wordpress installation is http://www.example.com.de/mywordpress/

aq_resize($full_image_url, 783, 520, true);

It only returns full image url path and it didn't give me crop image size? So, my question is
Doesn't image crop function work with wordpress subfolder?
Doesn't that crop function work with http://www?

Please help me, I have tested for a few hours. Thanks in advanced