February 9, 2018 2:22AM PST February 9, 2018 10:22AM UTC
[Identified] A small number of Forms for Office 365 customers have reported an issue when saving a Nintex for Office 365 form within SharePoint. Upon saving the form, the Save dialog window displays an indefinite spinner ‘Working on it’ and does not close. The workaround is to close the Save dialog window via ‘Close ‘X’. Background processes have completed successfully. This also affects forms within Flexi Task.
Nintex is working with Microsoft to provide a fix.
Nintex Workflow for Office 365 - Workflow Designer
Nintex Workflow for Office 365 - Workflow Execution