kb5070311

Microsoft has confirmed that the December preview for Windows 11 — the optional update KB5070311 (builds 26200.7309 for 25H2 and 26100.7309 for 24H2) released December 1, 2025 — introduces a set of user-facing regressions that are producing widespread annoyance and, in some configurations...

Microsoft’s December optional update for Windows 11 (KB5070311, OS Builds 26200.7309 and 26100.7309) patches a recently reported explorer.exe race-condition that could crash the taskbar and Start menu after certain notifications — but it also introduces visible regressions and deployment...

Microsoft has quietly acknowledged and patched two of the most aggravating Windows 11 regressions that have been plaguing users over the last few weeks: a race-condition that could cause explorer.exe (and therefore the taskbar and Start menu) to stop responding after certain notifications, and a...

Microsoft’s latest optional Windows 11 preview intended to deliver a long‑promised, cohesive dark mode for File Explorer instead introduced a jarring regression: after installing the December 1, 2025 preview (LCU KB5070311, paired with SSU KB5071142) some users report a brief, near‑full‑window...

Microsoft’s December preview for Windows 11, distributed as KB5070311, was intended as a modest quality‑of‑life update that pushes dark‑mode consistency deeper into File Explorer — but it has an unfortunate side effect: some users report a brief, full‑window white flash when opening File...

Microsoft’s December preview (KB5070311) promises a more consistent dark mode across File Explorer, but it shipped with a glaring regression: a brief, full‑window white flash whenever File Explorer opens in dark mode, a problem Microsoft has acknowledged and labeled a known issue while it works...

Microsoft pushed a focused Release Preview package on December 1, 2025 — KB5070311 — that updates Windows 11 on both the 24H2 and 25H2 servicing tracks (OS Builds 26100.7309 and 26200.7309) and pairs modest but widely useful UI polish with device‑gated Copilot+ improvements and an important...