I just upgraded to Drupal 7 from Drupal 6. It appears I've finally gotten everything working, except the module updater isn't working; it can't update from a URL or a file. I also cannot install new modules.
I check the box next to the module to update and it appears that it's working, or downloading; it works for a few seconds, then it just reloads the updater page and nothing has changed. It is the same when I install a new module, entering the URL for the module, or choosing the file from my computer. Again, it appears to be working, but it just reloads the module install page.