LM Studio runtime auto-update silently breaks model loading on RTX 5090

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A background auto-update of LM Studio's CUDA runtime extension pack caused model loading to fail on an RTX 5090 GPU, with the app displaying only a cryptic large unsigned exit code and no useful explanation. The exit code, when converted to hexadecimal, revealed an NTSTATUS driver-level error, pointing to a CUDA kernel crash rather than any issue with the model file or configuration. Developer logs identified the root cause as a broken flash-attention kernel fallback path in CUDA 12 runtime v2.27.1, which lacks proper support for NVIDIA's Blackwell architecture (sm_120). Rolling back to runtime v2.25.2 via LM Studio's Settings > Runtime menu restored functionality immediately, without any model re-download or driver changes. Users are advised to disable the "Auto-update selected Runtime Extension Packs" setting until a fixed runtime is released, and to check runtime versions first whenever a previously working model suddenly fails to load.

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