Hi Dalvir,
We regret very much for the delayed response. I have tested for this issue and was able to reproduce this issue in version 5.2.0.25. However, in the latest version when zoomed in values than 10 seconds, it is possible to view the line, but the scrollBar fails to work after that. It is suspected to be a defect and I have created a defect report [#11064] with high priority and have forwarded to our Development Team. I will get back to you regarding the time line for fixing this issue with in two business days.
You can track the progress of this bug fix in this link below.
Defect #11064 - Zooming is not working properly when the Zoomfactor is very small.Kindly let us know if you need any other information. Thanks for your patience.
Regards,
Manohari.R