Hi, For anyone who can't build Yhc anymore, please do "scons fullclean; scons depends". To Andrew: please do that to every buildbot which has started failing. Today I released Uniplate: http://www-users.cs.york.ac.uk/~ndm/uniplate/ The Yhc.Core library is now moving from Yhc.Core.Play to Yhc.Core.Uniplate - you'll find it runs faster, does more things and is better documented. Uniplate is an evolution of Play, driven from my experiences using Play in Yhc. The use of Uniplate in Yhc is covered in section 4.1 of the draft Uniplate paper on the website. I'm going to leave Yhc.Core.Play around for a while, but it is going to die at some point (several months at least) - if anyone had made use of it and needs help moving to Uniplate let me know. Thanks Neil