With any software product you will occasionally have a release that you wish you could take back.  Microsoft had Windows Vista, and Tuesday we had DotNetNuke 5.3.0.  We had a couple of significant bugs which slipped through the QA process and which resulted in a major impact to customers.  Rather than continue to compound the problem we have made the decision to pull the 5.3.0 packages from CodePlex and from DotNetNuke Support Network while we test a 5.3.1 release which we expect to release early next week.  5.3.1 is specifically going to address the following issues:

• Email is not delivered to end users and instead a significant number of system emails are being sent to the administrator account instead.  This impacts the ability of users to register and to get password reminders and as such is a showstopping bug that will be fixed in 5.3.1.
• Synchronize and SynchronizeFolder in the FileSystemUtils class have a breaking change in the API.  Overloads will be added to 5.3.1 to allow existing modules which call this API to continue to function.
• Updated XML module.  Although we highlighted the issues with XML module in the release notes, we were working on a fix to this module to be released this week.  This will be included with the 5.3.1 package.