The following error is generated in Open Workbench (OWB).
"Encountered an improper argument"
After clicking the OK, OWB is closed.
This is a custom view that was set as the default view that worked prior to upgrade.
In previous releases of OWB, the ETC field was named as "ETC", during View creation.
In newer releases the name was changed to "Estimates to Complete".
If an older view still references the old name, this may cause the issue.
Release : 15.9
Component : SAAS OPEN WORKBENCH (OWB)
The old field needs to be removed, and the newly named field should be used instead.