You have created a custom schedule for one of your inventory policies and saved the policy. You come back to check or edit the schedule, but the pop-up is blank when using Edge or Chrome. It displays normally if using Firefox or Internet Explorer.
Altiris.Inventory.Web.dll under to ..\Altiris\Inventory\Web\bin
OfflineClientTaskPolicy.aspx under to ..\Altiris\Inventory\Web\Policies
ITMS 8.5 RU4
This issue is not present with our ITMS 8.6 release.
A pointfix for customers with ITMS 8.4 RU4 can be found under the Inventory Solution section in KB 198337 "CUMULATIVE POST ITMS 8.5 RU4 POINT FIXES"