Project Default Time Zone Error

I get the below error when I set the Default Time Zone in my project settings. The error prevents me from starting the project. Anyone have a workaround for this?

com.mendix.m2ee.api.AdminException: Starting Mendix Runtime failed. at com.mendix.core.impl.MxRuntimeImpl.fireZeeMissile(MxRuntimeImpl.java:484)

Caused by: com.mendix.core.CoreRuntimeException: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: Object id: 8444249301321782, validation errors: (member: Name, message: This user name is already in use.) at com.mendix.core.actionmanagement.ActionManager.executeInTransactionSync(ActionManager.java:143)

Caused by: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: Object id: 8444249301321782, validation errors: (member: Name, message: This user name is already in use.) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:178)

Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: Object id: 8444249301321782, validation errors: (member: Name, message: This user name is already in use.) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36)

Caused by: com.mendix.systemwideinterfaces.core.UserException: Object id: 8444249301321782, validation errors: (member: Name, message: This user name is already in use.)