SSBB 4.1B also requires SSBB 4.0: [ame="http://orbithangar.com/searchid.php?ID=3062"]Space Station Building Blocks 4.0[/ame]
The installer is great, BTW!
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Hmm, I'm able to create IMS modules with the scenario editor after installing SSBB 4.0 and 4.1B, but any scenario with IMS ship is still causing CTDs without log entry.
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Ok, strike that... XP SP3 compatibility mode fixed it,
and SSBB 4.0 would only be required if it is used with spacecraft 3.