Thank you for contacting Syncfusion support.
Query 1: The SyncFusion controls separator disappears before starting Visual Studio 2017 Pro.
We were not able to understand your problem with your previous update. Can you please share whether you are facing issue while using controls from the Toolbox? If possible, can you share the video/screenshot which replicates the issue? It will help us to resolve your problem at earliest.
Query 2: I cannot use RibbonControlAdv because it displays an error message like the following:
Error al generar el código para la propiedad '<nombreDePropiedad>
We have checked the reported behavior of RibbonControlAdv by drag and drop into the form from Toolbox in 126.96.36.199 version and we were unable to reproduce the reported error from our side. So, can you please share the below details
1)Essential Studio version which you are currently using.
2)OS in which the application runs.
Also, if possible please provide simple sample which replicates the issue?