Interactive Service Hub Case form Timeline issue

Hi,

We recently upgraded to Service Pack 1, and since then we have been facing issues with Interactive Hub Case form. The form has a timeline section to display all the activities associated with the case. This section displays all the activities once it is created, but as soon as it is assigned to a user the section comes up blank. If someone could help shed some light in this, it will be helpful.

Thanks,

Nishant