Items resolved:
"(Orion Platform 2015.1 Hotfix 4)
6. Alert schedules that occur during the Daylight Saving Time change (2:00 a.m. - 3:00 a.m.) may no longer respect your maintenance windows.
7. You receive false alerts about node reboots when users set nodes to "Unmanaged".
8. You can only select individual recipients when sending page or SMS message with NotePager Pro.
9. The Alert Manager in the web is empty when you have more than 5,000 alerts.
10. The ampersand (&) is counted as an illegal character in email addresses in alert and report actions.
11. The trap service stops after 45 minutes.
12. VM Associations are incorrect in AppStack.
13. Volume polling fails in Orion Platform when VMan integration is enabled.
14. Database maintenance deletes alert history for all reset alerts."
After the issues encountered with the incorrect install instructions on HotFix3 I'm not going to dip my toe in the water with this Hot Fix just yet, please reply if you do venture forth and try it out.
Edited to replace NPM with Orion