After installing CU 9.1.17.29 for Microsoft Dynamics CRM 9.1 on a clients deployment we noticed that the custom help panes and guided tasks(contextual help) has stopped working.
The client deployment was upgraded from CU 9.1.10.102 where it was working.
We have confirmed that this hasn't been fixed in neither of the CU that was released after this one, which is 9.1.18.22 and 9.1.19.10(latest), so we can safely say that the issue was introduced in any of the updates released between CU 9.1.10.102 - CU 9.1.17.29.
As we do have a working deployment with the old CU 9.1.10.102 I ran some DevTools to see the differences between that version and the most current update CU 9.1.19.10.
On CU 9.1.19.10 (non working) it seems to be related to a missing javascript(111.js) that is not present in the //CRMWeb//uclient//scripts// when you click the Help button(?)
As an little experiment in a lab env. I copied the contents of //CRMWeb//uclient//scripts// from CU 9.1.10.102 deplyment to the lab. CU 9.1.19.10 and with this the Contextual help started working.
Obviousy this isn't a valid workaround, but it sort of tell that the issue is isolated to a new set of scripts in one of the CU's released after CU 9.1.10.102.
I hope this finds any MS Rep. in this community to forward to the on-premise packaging team to be addressed.
Best regards.
Philip