Spychotic

Hi, I have a very perplexing problem. I'm trying to get KW Rocketry to work with version 1.2, so I downloaded and installed this. Problem is, the 3.75m half reaction wheel wasn't working. "Invalid or experimental parts". So, I read through this topic, and re-installed it. I thought that having missed out Module Manager the first time might be the problem. And it does seem to have been so; having installed ModuleManager, the 3.75m reaction wheel halves work fine. But the Thor II SRBs don't... when they worked before. So I delete Module Manager to see what that does - and the Thors now work, but the 3.75m reaction wheels don't. Can anyone shed any light on this please? Spike