Antwort #4 am: 15. Februar 2016, 17:36:35
If the green line doesn't appear, there might be a problem with storing the image.
Is your webserver having the permissions to write the image?
Do you have access to the error log file of the Webserver? What says it, if you save an image?
One thing that might have changed is the PHP version. At the moment a lot of providers switching php 5.6 off. If there are "deprecated" warnings inside the image create function, the header of the image is killed by the warning and so the image is dead.
Check in Backend Hilfsprogramme -> Server Info your PHP Version
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If it is higher as 5.4 you should look for the PHP5.6 fix here in the forum or install the servicepack 3