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Problem has been solved. Modifies action list persists, but removed actions can be re-activated only by importing plugin which contain appropriate action. In this case all actions contained in plugin are visible and active again.
Resolved Bugs
[SPLEX-940] - Problem accessing all available log file backups
[SPLEX-943] - Fixed bug in plugin check_interfaces when running in SNMP
service daemon mode[SPLEX-942] - Problem changing admin password using SONARMANAGER
[SPLEX-941] - Fixed MIB import while SNMP Debug Level is DEBUG or TRACE