Did you change only the name of the domain or also the location? If you don't get any error messages in the debug outpu at all t (also check the logs for your previous attempts) make sure that the file permissions for the var folder and its subdirectories are correct.
If you upload a file with PHP, the file is first stored in whatever you have specified as tmp directory in your php.ini. Then your script (the action of the form you used to upload) moves the uploaded file to the final destination directory, e.g. /var/storage
So you have to make sure that PHP can acess both the tmp directory and the /var directory (and all its subfolders).
It is not always necessary to create a tmp directory for PHP as long as PHP can access the system default: http://lu.php.net/manual/en/ini.core.php#ini.upload-tmp-dir
You could try whether the problem is caused by EZ by writing a small php script that allows you to upload a file and moves this file into the var directory, but you need at least a bit of PHP knowledge for this.
Also don't forget to enable full debug output and check whether you get anything there, maybe the problem is not caused by any permissions. Also check whether the problem occurs for all kinds of upload or maybe just for images or just for packages.
Good luck
Claudia
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