Sorry about the inconvenience caused.
We would like to inform you that , our latest version of Essential Studio is 126.96.36.199 , and we could not able to reproduce the issue reported by you in this version while rendering Gantt . Can you please share us the detail of the Essential Studio version you are using ? . This is will be helpful for us to provide the solution even better .
Also we have prepared a sample for rendering Gantt with the latest version of Essential studio. Please find the sample in the below location ,
If you still facing problem to render the Gantt Control, Please revert us by modifying the sample according to your requirement along with the replication procedure to help you better.
We regret for the inconvenience caused.
We were able to reproduce the issue in updating the toolbar with empty data source and we have confirmed this as bug and logged a report on this. Also we have created a support incident under your account to track the status of this issue.
Please log on to our support website to check for further updates.
Please let us know if you require further assistance on this.