I started experiencing this problem within the last 2-3 weeks I think.

A client is trying to download files she purchased a month ago. She's downloaded them before but for some reason it now returns "403 Error - Access Denied" when she tries to download them. She purchased new files the this week and she can download them with now problems. This is not the only person having this problem. The Files says it is active and the download limit and all other settings are set to Unlimited.

I can't think of anything that is different except maybe for the module updates. I've done update database and clear cache under Performance. The system has been working stable for a couple of months now. Now it seems to be picking up a lot of these Access Denied errors from different users. The website has about 2000 registered users, 15 000 pageviews per month and lots and lots of purchases.

I logged this error a while ago on Drupal.org as well: http://drupal.org/node/1663692

Please please help