Fix ERROR_GRAPHICS_OPM_PARAMETER_ARRAY_TOO_SMALL (0XC0262504)

0XC0262504 means a graphics component got handed a buffer too small for the data it was asked to return. Usually it's a GPU driver throwing this during HDCP/OPM setup.

So Windows is throwing ERROR_GRAPHICS_OPM_PARAMETER_ARRAY_TOO_SMALL and your screen is going black, or your playback app is crashing on launch. Annoying, I know.

Here's the short version: the graphics stack was asked to fill a buffer with Output Protection Manager (OPM) data, and the buffer wasn't big enough. That's a bug in whoever sized the buffer, which 99% of the time is your GPU driver or an HDCP-aware app sitting on top of it. This is not a user error. You didn't do anything wrong.

The fix (do these in order)

Roll back or update the GPU driver. This is almost always the culprit. If it broke after a Windows Update pushed a new driver, roll back first — faster than waiting for a vendor to ship a fix.
Run the display driver reset. Win+Ctrl+Shift+B resets the graphics stack without a reboot. It won't fix the underlying bug, but it clears stuck OPM sessions so you can boot into Windows and work.
Disconnect the HDCP sink. Unplug any HDMI/DisplayPort splitters, capture cards, old AVRs, KVM switches, or that cheap HDMI-over-IP extender you forgot about. OPM only cares about protected content paths — a bad HDCP repeater is a classic trigger here.
Kill or update the app that triggers it. Netflix, Prime Video, Blu-ray players, and some DRM-heavy streaming apps call OPM directly. If the crash happens only inside one app, that app is passing a buffer size the driver disagrees with. Update it, or switch to the Store version.

If step 1 alone doesn't stick, do a clean install of the driver, not an upgrade-in-place. DDU (Display Driver Uninstaller) in safe mode, then install the vendor's own package:

# Safe mode, then:
# 1. Run DDU -> Clean and restart
# 2. Install NVIDIA/AMD/Intel driver from vendor site
# 3. Do NOT let Windows Update push a driver on top

Block the Windows-provided driver afterward, or Windows will quietly reinstall the broken one on the next Patch Tuesday:

reg add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\DriverSearching" /v SearchOrderConfig /t REG_DWORD /d 0 /f

Why this actually works

OPM is the layer between your app and the GPU that negotiates HDCP. When an app wants to play protected content, it queries the driver for capability arrays — connector counts, protection types, HDCP versions, that kind of thing. The driver returns a size, the app allocates, everyone's happy. Except when the driver's reported size doesn't match what it actually returns on the second call.

That mismatch is exactly what 0XC0262504 is complaining about. It's not that your buffer is wrong. It's that the driver promised one size and delivered another. Common triggers I've seen:

NVIDIA drivers 511.x through 516.x on multi-monitor setups where one display is on DisplayPort and another on HDMI.
Intel iGPU + discrete GPU laptops where the OPM stack gets punted between the two depending on power state.
Any setup with an HDMI splitter that doesn't forward HDCP correctly — the driver correctly reports "protected path available," the app asks for capability details, the splitter drops half the response, boom.

Rolling back the driver fixes it because the previous version sized those arrays correctly. Disconnecting the splitter fixes it because the capability path becomes deterministic again. Killing the offending app fixes it only for that app — everything else keeps working because it doesn't exercise the broken code path.

Less common variants

Virtual machines and RDP sessions

If you're seeing this inside a VM or over remote desktop, the guest GPU driver is trying to do OPM against a virtual display that has no HDCP endpoint. The fix is to disable hardware acceleration in whatever app is complaining, or to swap to a GPU-passthrough setup. There's no clean fix on a basic VirtIO/vGPU display — the OPM contract just doesn't apply.

Capture cards and streaming rigs

Elgato, AverMedia, Blackmagic — all of them pass HDCP through (or should), and all of them can trigger this when firmware is behind. Update the capture card firmware before you touch the GPU driver. I've wasted hours on driver reinstalls when a 30-second firmware update on an HD60 S was the actual fix.

Protected media in browsers

Edge and Chrome use Widevine/PlayReady, which call into OPM for HD content. If only browser playback crashes and everything else is fine, check edge://gpu or chrome://gpu. You'll usually see the OPM feature flagged as disabled or in a degraded state. That tells you it's the browser's hardware DRM path, not the driver itself.

Multi-GPU laptops

NVIDIA Optimus and AMD Switchable Graphics can shuffle OPM calls between the iGPU and dGPU mid-session. Forcing the app to run on the discrete GPU via the Windows graphics settings (Settings → Display → Graphics → pick the app → High performance) makes the path deterministic and often clears it.

Prevention

You can't fully prevent a driver bug. What you can do is not make it worse:

Keep a known-good driver version archived. When a Windows Update breaks things, you roll back in 10 minutes instead of two days.
Set Group Policy or registry to defer driver updates through Windows Update — feature updates and "optional" driver packages are where this nonsense comes from.
Don't chain HDCP devices. Every splitter, extender, and AVR in the path is another place for the handshake to go sideways.
On production workstations, test a driver for a week on one machine before pushing it to the fleet. Sounds obvious. Nobody does it.
If you're building a streaming or NLE box, buy capture hardware with a firmware update channel that isn't dead. Cheap no-name HDMI capture dongles stop getting firmware the day they ship.

And if you're hitting this on a machine you can't touch — a managed laptop, a locked-down VM — escalate to whoever owns the graphics driver baseline. You can't fix this from the user side. The buffer sizing is baked into the driver, and no amount of settings tweaking changes that.