ODK Aggregate Errors ver 1.4.7

What is the problem? Please be detailed.
When using either Briefcase or Export from Aggregate server one form always fails. Logs on server originally showed:

org.opendatakit.common.persistence.exception.ODKEntityNotFoundException: Unable to retrieve smextodk01._task_lock key: [KEY DELETED]
org.opendatakit.common.persistence.exception.ODKEntityNotFoundException: Unable to retrieve smextodk01._task_lock key: [KEY DELETED]
[root@[SERVER NAME] tomcat6]# grep "Unable to retrieve [SERVER NAME]._task_lock key"

After opting to skip malformed submissions still fails but new error:

Caused by: java.lang.IllegalStateException: Expected exactly one match in phantom reconstruction! SELECT * FROM WOMEN22E_NEW_CORE2 WHERE _TOP_LEVEL_AURI = uuid:991a3f24-212d-4595-846f-b086820bf96d AND _PARENT_AURI = uuid:991a3f24-212d-4595-846f-b086820bf96d => expected 1 row but found 2

All other forms work fine. Earlier deleting forms that were successfully downloaded allowed us to eventually get all submitted forms.

What ODK tool and version are you using? And on what device and operating system version?
ODK Aggregate 1.4.7
Briefcase v1.4.6
OS: RedHat Linux Enterprise 64-bit virtual machine

What steps can we take to reproduce the problem?
I think you'd need my form and 500 or so submissions

What you have you tried to fix the problem?
Option to skip malformed submissions

Anything else we should know or have? If you have a test form or screenshots or logs, attach here.
see above for log snips