ISE 2.7 Unable to save policy conditions for Device Network Conditions

[Alexnco123]

On ISE 2.7.0.356/3,5,7>>
Even with Super Admin rights, or specifically Policy Admin rights, attempting to modify a Device Network Condition (trying to add and remove asset names and/or IPs) provides a "Save" button that stays grayed out (ghosted). 
Makes no difference which browser is used (Chrome/FF/Edge).
Makes no difference if trying to add an IP or to add a device from the pull-down.  (Why, oh why, is this list NOT alphabetical??
Attempted to create a duplicate "Device Network Condition", in this case the duplicate has an not-grayed out Save button (appears to work as intended), but clicking it never completes the save (IOW, the action stays busy forever and the duplicate never gets saved.)
TIA!

[ahollifield]

Patch level?

[Alexnco123]

Thanks for asking, the version deployed is 2.7.0.356, p3,5,7.
I updated the main question and also corrected and added a few details.

[thomas]

Could be a bug.

I never use Device Network Conditions.

What are you trying to do?

Maybe there is another (better?) way such as using Network Device Groups?