I've not used it much at all with any version of Spring. But I'm curious: What problems are you having with Spring 3.0.5? There might be an obvious fix.
Spring Social currently works with both Spring 3.1.x and Spring 3.0.x, but has to do some decision making in the process to decide how to deal with certain RestTemplate interceptors which are only available in Spring 3.1.x. Perhaps the Tumblr module is doing something out of sorts that makes it only work with 3.1.x.
FWIW, when Spring Social 3.1.0 is released it will no longer support Spring 3.0.x. Just a heads-up and strong suggestion to move to Spring 3.1.x as soon as possible.
Spring Social Project Lead