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Major. DropEveryTwinForEndedServerSession drops every twin with InProcessTeardown() answering true, which is exactly the case in which a texture / sampler twin's destructor does NOT scrub itself out of TextureImpl::g_boundTexturesCache / SamplerImpl::g_boundSamplersCache. The shadows kept raw pointers to freed twins; the next in-process session's twin allocated at a recycled address read "already bound" and skipped its glBindTexture / glBindSampler on a context where nothing was bound, so its uploads went to texture 0 and it rendered black. The drop now empties both shadows and puts the active-unit shadow back to 0 (the new context's GL_TEXTURE0). SanityTest EsprytServerSession.TheServerBackendsDestructionEmptiesTheTextureAndSamplerUnitShadows (split build only; the pull build is unchanged, G1).