I've tested queries and result is mostly OK.
queryUserByUserId (&(objectClass=user)(sAMAccontName=some.user)) is OK
queryUserByUserId (&(objectClass=user)(cn=Some User)) is OK
queryUserByFullNameLike (&(objectClass=user)(|(givenName=*Some*)(sn=*User))) doesn't return user
queryUserByFullNameLike (&(objectClass=user)(givenName=*Some*)(sn=*User*)) is OK
Correcting this query definition in the activiti-standalone-context.xml doesnt solve problem.
queryGroupsForUser" value="(&(objectClass=group)(member=Some User,OU=SomeOrganizationUnit,DC=domainname,DC=local)) is OK
It looks like search action is not triggered after entering several letters to the form field.
I had the same behaviour in activity-explorer 5.12.1. while user cache was misconfigured through activity-ui-context.xml.