Looked at release notes but struggled to spot the .004 difference!
Deeper looking produced...
5.1.43. Resolved in Build 18.104.22.168.373
5.1.44. Resolved an LDAP issue with long organizational unit names that could prevent users from successfully authenticating. (ID ER-1525)
5.1.45. Resolved an issue that could cause the management interface to become unresponsive after upgrading from 9.6 or 9.7 to 9.8.
Have upgraded from 369 and no issues to report so far. Joy.