The 4.1.8 release is a bug fix release that contains a new feature improvement.
Feature Improvements
IM-1255 - User customizable header and support links. Under Admin->Application Settings, you can now set your own custom header image (note the image size), as well as email and phone number to contact for support.
Bug Fixes
IM-1317 - IPAM Gadget - Region dropdown is blank when editing
IM-1313 - $GENERATE on DNS not producing appropriate PTRs
IM-1310 - Admin-Users - Check User Permissions field no longer working
IM-1306 - Unable to add maintainers to new LIRs
IM-1302 - Can't Smart Assign when using the LIR parameter
IM-1237 - Admin->API page loading very slow even with no data
IM-1229 - RIR Integration missing link to LIR Manager if no LIRs exist
IM-1182 - API - fix request generator to updated resource parameters
IM-1121 - Logging message missing data for outbound contact email