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@stoffal: possibly an issue with permissions of the data directory. Can you upload profile images and images using the bundled files plugin? If yes, the data directory permissions are not the problem. But if this also fails, the permissions of the data directory are wrong (does not allow files to get saved).
Which version of Tidypics do you have installed? Is it the latest version (1.8.1beta12)? If not, this might explain the problem, because if you use a version older than 1.8.1beta6 it won't work on Elgg version newer than 1.8.15.
Have you checked if there might be a conflict with another 3rd party plugin installed on your site yet?
@stoffal: and you might need to increase upload_max_filesize and post_maxsize in your .htaccess. If you use the GD image library for the image resizing in Tidypics you might also want to increase memory_limit to allow for handling of larger image files.
@iionly: i can upload and update profile images. i use the latest version 1.8.1beta12 of this plugin.
can you see in this screenshot if settings are ok
@iionly: i disabled all other plug-ins but didn't help
@stoffal: the values of the php variables seem okay. upload_max_filesize of 200 MB should be more than enough for Tidypics. And post_max_size of 200MB should also be enough for Tidypics (though in general post_max_size should be set larger than upload_max_filesize to allow for additional overhead in case upload_max_filesize is used up to the limit).
Which image library have you selected on the "Einstellungen" tab? Imagick php extension will not work. GD library is installed on your server and if the imagick executables are available on your server is not possible to say from the server info tab. GD library should work though (as it's also used on profile image upload).
I have to admit that I'm out of ideas at the moment. Do you see any error or warning entries in the server logs at the time you upload images?