August 11, 2015, update for Project 2013 (KB3055022)

Applies to: Project 2013 StandardProject Professional 2013

This article describes update KB3055022 for Microsoft Project 2013 that was released on August 11, 2015. This update has a prerequisite.

Be aware that the update in Download Center applies to Microsoft Installer (.msi)-based edition of Office 2013. It does not apply to the Office 2013 Click-to-Run editions such as Microsoft Office 365 Home. (How to determine?)

Improvements and Fixes

Fixes the following issues:
  • When you create a visual report that is based on task usage data in Project 2013 and set the level of usage data option to weeks, you may receive the following error message:
    Unknown error has occurred. An error occurred and the requested action could not be completed at this time.
    You may also receive the previous error message when you try to save cube data.

    Then, if you click OK, you receive the following error message:
    This is not a valid file name. File names must be less than 255 characters and they cannot contain any of the following characters: \ " / ; ? < > |
  • If a subproject in a master project has a baseline date that is earlier than its start date while the master project does not have a baseline set for the task that represents the subproject, you may be unable to create a visual report for the master project in Project 2013. Instead, you receive the following error message:
    An unknown error has occurred.
    An error occurred and the requested action could not be completed at this time.
  • When you use Project 2013 to open a project that is saved in Project Web App, the start date and the end date of a task is reset to the constraint date instead of the dates that are scheduled according to the associated summary task. This issue occurs if you set the Calculate project after each edit option to Off.
  • When you try to synchronize tasks with a SharePoint task list in Project 2013, Project 2013 crashes.
  • Consider the following scenario:
    • You use Project 2013 to open a project file (.mpp) from a SharePoint document library.
    • You Save the file to a nondefault file format such as .txt, csv, or xlsx.
    • You keep the MPP file open.
    • You make some changes to the project, and then save it.
    In this scenario, the changes that you made to the MPP file are not saved properly.
  • If you save a project as an .xml file, custom calendar information may not be saved. Therefore, when you open the .xml file, the calendar information is not found.
  • When you open an XML project file in Project 2013, a milestone task that is marked as completed may incorrectly be set to 99%.
  • When you set a baseline for a project in Project 2013, if a cost resource is assigned to a milestone task, the sum of the timephased cost for that assignment is displayed incorrectly as the assignment remaining cost.

How to download and install the update

Microsoft Update

Use Microsoft Update to automatically download and install the update.

Download Center

This update is also available for manual download and installation from the Microsoft Download Center.If you are not sure what platform (32-bit or 64-bit) you are running, see Am I running 32-bit or 64-bit Office? Additionally, see more information about how to download Microsoft support files .

Update information

Restart information

You may have to restart the computer after you install this update.


To apply this update, you must have Microsoft Project 2013 Service Pack 1 installed.

More Information

To determine whether your Office installation is Click-to-Run or MSI-based, follow these steps:
  1. Start Project 2013.
  2. On the File menu, click Account.
  3. For Office 2013 Click-to-Run installations, an Update Options item is displayed. For MSI-based installations, the Update Options item is not displayed.
Office 2013 Click-to-Run installationMSI-based Office 2013
The screenshot for Project Click to Run The screenshot for Project MSI


See the information about the standard terminology that is used to describe Microsoft software updates . The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office.