The problem shows up after my WP/MAMP setup transfered from single-site to multisite (with sub-directory). Any operation, with dashboard, that include file upload, e.g. wp upgrade, theme installation (search install, or upload install), plugin installation (same as theme install) fails. The error message is always about the local wp root directory. e.g. for wp upgrade ( to 3.3.2), it says:
Downloading update from http://wordpress.org/wordpress-3.3.2-partial-1.zip…
Unpacking the update…
Could not create directory.: /Users/ivan/Sites/wordpress/wp-content/upgrade/wordpress-3.tmp
The error message is similar for theme and plugin installation, the only difference is the directory, ".../upload/2012/4/"... says invalid URL.
Setting the permission in MAC for wp-content to be r/w for www, staff, everyone. but the problem is still there.
Of course, the master site and the other sites works well basically.
Anyone have a clue or suggestion about this problem.
Your kind help is appreciated.