An error is thrown on the Style Editor page when creating/editing a report. The message is "Some problems appear during saving". It happens when trying to Back, Jump To, Next, or Save As. When clicking on Save, Reset, or Preview nothing happens.
I have to use the back button to get off the page and save the report. This started happening after updating to 10.4.36140.
Version 10.4 doesn't have a Style Editor. Are you talking about web reports? If yes, you need to upload your project to Demo Account and contact support directly with instructions on reproducing this issue on Demo Account.