Is there a way to recover / reset lost passwords for library or applications in control builder.
Only way is using a old backup where password was not provided..
Application -> Can be restored from backup (if it was taken without password)
Libraries -> From Admin structure, you have to unregister the related system extensions, replace the existing libraries with Open state libraries(you should have a backup of open state libraries) and then reload the system extension again.
Both process are little complicated and risks involved.
Contact your ABB Regional Support for further assistance.
Hope it helped..