You cannot switch the user account in SharePoint Designer 2013

SharePoint Designer is a powerful application that enables the rapid creation, editing and deployment of content on the SharePoint platform.

Microsoft has already published a document on this issue and here is the KB article for this:

Microsoft KB: http://support.microsoft.com/kb/2738178

Additional references:

Please refer the following error messages:

1.      Indexer process doesn’t free up old memory after repartitioning

2.      New-SPEnterpriseSearchIndexComponent checks the existence of RootDirectory in the wrong server

3.      PerformancePoint Dashboard Designer Help doesn’t open as expected

4.      PowerPoint intent isn’t shown

5.      Repair operations on SharePoint Standalone can delete your content database

6.      WSS Sync failed to run in because of a lack of profile database permission

7.      Cannot process argument because the value of argument"implementingType" is null. Change the value of argument "implementingType" to a non-null value.

8.      "Error occurred in deployment step 'Add Solution': Cannot start service SPUserCodeV4 on computer ..."

9.      Unable to retrieve topology component health states. This may be because the admin component is not up and running.

If you are facing any error messages which are listed above then please refer the following Microsoft article for the details workaround information:

http://office.microsoft.com/en-us/help/sharepoint-server-2013-known-issues-HA102919021.aspx

If you have any queries/questions regarding the above mentioned information then please let me know. Thank you.