Many thanks for your reply.
Since I made the post, I have realised that I have an issue with one of the processes which runs an ldap query, and is called (as a web service), by the form in another process.
I have successfully installed Active Directory, and am assuming that there is nothing else I need to do to support the use of the ldap query.
Following the documentation at
http://livedocs.adobe.com/livecycle/es/wb_help/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Workben..., I have made a guess at what settings I actually need, as follows:
Initial Context Factory: com.sun.jndl.ldap.LdapCtxFactory (the default).
Provider Url: ldap://kananga:389 (kananga is the name of my computer).
Username: Administrator (the name of the user I log in with).
Password: evenlogic (the password on the Administrator account).
Other Properties: (blank).
This has resolved my original issue (i.e. the form now runs), however the ldap query itself still does not work. When I try and open it in design mode, I get the following error:
ALC-DSC-000-000: com.adobe.idp.dsc.DSCRuntimeException: Internal error.
Any advice would be most appreciated.