On my test server, while attempting to upload about ten .odc files to the Trusted Data Connection library in Project Server 2013's business intelligence center, I came across this message:

I quickly found the explanation of the behavior here:  http://blogs.technet.com/b/seanearp/archive/2010/07/08/your-client-does-not-support-opening-this-list-with-windows-explorer.aspx

And the fix here: http://technet.microsoft.com/en-us/library/cc772567.aspx

This DOES require a reboot.

 I ran into this problem again with a Project Server 2007 customer today.  The project plan had more than 2000 lines and the % Complete at the Project Summary Task level did not make sense to the project manager; it seemed much lower than it should have considering the work already done on the plan.  This is because of how the % Complete is calculated for summary tasks.  The apparent discrepancy is compounded when you have many summary and sub- tasks.

Here’s the article you will need to explain to anyone how the % Complete field is calculated.  It’s old, but pertinent even for the most recent version of Project, and was provided by Microsoft Customer Technical Support.

      “How Percent Complete Is Calculated for Nested Summary Tasks” http://support.microsoft.com/kb/101495/EN-US. 

You may also consider setting calculations to be automatic in Project 2007 using the instructions below.  This won’t change how the % Complete field is calculated but will show how changes to the plan affect the plan automatically.  Also ensure there are no resources assigned to summary tasks at any level and no tasks are successors to the project summary task.

To set the calculation mode in Project Pro 2007 to automatic using below steps.

      1. Open Project Professional
      2. Select Tools > Options>
      3. Select Calculation Tab.
      4. Set the Calculation Mode to Automatic.

Today, I learned that Alerts and Reminders isn't available in Project (2013) Online.

http://social.technet.microsoft.com/Forums/projectserver/en-US/a3d80d76-7d9c-4011-8a41-e7e0ff7a8bd8/alerts-and-reminders-in-project-2013-online

Edited 2014-01-15:

But wait, there's more...

Editing an enterprise custom field lookup table, I received an unexpected error with no other information in the PWA page.  The following error appeared in the ULS log.

Application error when access
/_vti_bin/PSI/LookupTable.asmx, Error='gzip' is not a supported encoding
name.  Parameter name: name 

 at System.Globalization.EncodingTable.internalGetCodePageFromName(String
name)   

 at System.Globalization.EncodingTable.GetCodePageFromName(String
name)   

 at System.Text.Encoding.GetEncoding(String
name)   

 at Microsoft.Office.Project.Server.PSIForwarderHandler.ProcessRequest(HttpContext
context)   

 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()   

 at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously)

I clicked on Start > Administrative Tools and launched Internet Information Services (IIS) Manager.

I clicked the root node of the server.

Then, I double-clicked Compression.

I unchecked "Enable dynamic content compression" and clicked Apply.

I reset IIS from a command prompt using the command iisreset.

I was then able to open the custom field lookup table successfully without error.

The August 2013 CU for Microsoft Project and Project Server 2010 and 2013 were released today. 

http://blogs.technet.com/b/projectsupport/archive/2013/08/13/microsoft-project-server-2010-and-2013-august-2013-cu-announcement.aspx

Please thoroughly test the CUs on a test environment before rolling out into production!  This link is an excellent place to start with functionality validation test plans: http://technet.microsoft.com/en-us/library/gg502592(v=office.14).aspx.

Download them into Word docs and store for repeatable test procedures you can modify to suit your business needs.