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I really don't know what to make of my current game status, or whether I'm being incredibly dim (always a possibility ;0)) or whether there truly is just something massively screwy about my installation. I'll explain: I'm in career mode. I have R&D as far as "advanced rocketry". I took on a contract - showing up in the Mission Control archives as completed - to "Haul RE-15 "Skipper" into orbit of Kerbin. I did this. I did however, recover the craft forgetting to take a crew report. No biggie except I got no science for the contract. Now, I have an active contract to "test 48-7S "Spark" liquid fuel engine in flight". Inside the VAB currently, in my "engines" panel, this 48-7S Spark is shown, but in a green-shaded box. If I try to use it, it tells me "contains untested experimental parts" and won't let me to launch. However - and here's the weird bit - despite having completed an earlier contract with the "Skipper" engine, this engine no longer appears anywhere, and is not available. Furthermore, it is now a part of "Heavy Rocketry" inside R&D. This is so confusing! I've completed a contract with an engine that I now no longer have, and have accepted a contract to test an engine, and which is available to select, but I am not allowed out of the VAB with. What am I doing wrong?