Hi Victor,
I'm testing site templates with .lrn 2.2 and having some problems. My installation is from the repository (acs-core 5.2.2 final and .lrn from oacs-5-2 branch), aolserver4, postgresql 7.4.7 on Debian sarge.
I can change the default site-template in dotlrn admin with no problems (it's applied after server restart) but when I allow communities/courses to change their own, the server stop responding when I go to a course/club portal. I've tried to restart my server after allowing communities to change their template but it doesn't solve the problem. I don't see anything in the error log neither.