Fixing “Allow Accessories to Connect” Glitches for Wacom/Tablets

On recent macOS versions, Apple’s USB security policies can silently block Wacom and third-party graphics tablets from transmitting data. When the “Allow Accessories to Connect” feature blocks or ignores your Cintiq, Intuos, or XPPen tablet, the hardware receives power but the operating system drops its data packets. This causes Wacom Center to report “No Device Connected,” strips pen pressure sensitivity, or completely freezes stylus tracking in Photoshop and Illustrator. Resolving this requires adjusting security permissions, clearing blocked USB descriptors, and restarting the input driver daemons.

Fast-Fix: The 45-Second Solution

Go to System Settings > Privacy & Security, scroll down to Allow accessories to connect, and set the drop-down menu to Automatically When Unlocked. Unplug your tablet’s USB/Thunderbolt cable, wait 5 seconds, and plug it directly into your Mac. When the macOS system prompt appears, click Allow. Next, open Activity Monitor, search for WacomTabletDriver, and click the X button to force a restart of the input service.

Quick Status Snapshot

• Severity Tier: Medium-High (Blocks pen pressure, custom express keys, and stylus tracking in creative apps)
• Project Risk: Interrupted digital painting, lost tablet configuration maps, and forced application restarts during active editing sessions
• Root Cause: macOS com.apple.usb.syspolicyd daemon withholding USB endpoint data access while allowing basic power delivery
• Rare Cause: Corrupted USB device authorization plists or signal degradation across unpowered third-party USB-C hubs

Low-Friction vs. High-Friction Scenarios

• Low-Friction Scenario: The connection prompt was accidentally dismissed or the security policy is set to “Ask Every Time.” Changing the setting to “Automatically When Unlocked” and reconnecting the USB cable clears the block immediately.
• High-Friction Scenario: macOS registered a permanent “Deny” state for the tablet’s vendor ID, or the driver’s Accessibility permissions were revoked during a system update. Resolving this requires clearing the USB authorization cache and manually re-authorizing Wacom daemons in System Settings.

Service-Level Mechanism

When you plug a drawing tablet into a Mac, two separate connections occur: power negotiation and data handshaking. Apple’s accessory security service (syspolicyd) acts like a security guard at a loading dock. It lets the power line through so the tablet display lights up, but locks the security door for data packets until the user manually approves the device.

If the prompt is missed or glitched, your tablet stays stuck in this half-connected state. The tablet receives power, but WacomTabletDriver receives zero coordinate or pressure data across the USB bus. Consequently, creative apps like Photoshop assume no tablet exists. If macOS update security policies are also stopping background driver launch tasks, see Why macOS Sequoia Blocks Adobe Background Processes by Default.

Diagnostic Contrast (Differential Diagnosis)

It is essential to distinguish between a USB accessory block and driver permission issues:

• Accessory Block vs. Input Monitoring Failure: If Wacom Center says “No Device Connected,” the issue is an Accessory Block. If Wacom Center detects the tablet fine, but pen pressure fails inside Photoshop, the issue is missing Input Monitoring permissions. To fix permission database corruptions, see [INTERNAL LINK: S05C02.31 – Fixing “TCC.db” Permission Corruptions for Adobe Apps].
• Accessory Block vs. Universal Control Jitter: If your pen tracking jumps or stutters near display edges on multi-monitor setups, the issue is often macOS pointer handoff rather than a hardware block. See [INTERNAL LINK: S05C02.14 – Why “Universal Control” Causes Mouse Lag in Photoshop].

What To Do Right Now

1. Bypass the Hub: Unplug your tablet from any USB hub or multi-port adapter and connect it directly to a native USB-C/Thunderbolt port on your Mac.
2. Adjust Security Options: Set System Settings > Privacy & Security > Allow accessories to connect to Automatically When Unlocked.
3. Restart the Driver Service: Open Terminal and run killall WacomTabletDriver to force macOS to re-scan for connected tablet hardware.

Hard-Stop Failure Signals

Stop basic troubleshooting and check hardware health if you encounter these red flags:

• Missing from System Information: The tablet does not appear under Apple Menu > About This Mac > System Report > USB, indicating physical cable or port failure.
• Terminal Access Denied: System returns “Operation Not Permitted” when attempting to restart hardware daemons. If your Terminal permissions are locked out, follow Fixing “Operation Not Permitted” Errors in Terminal for Adobe.

The Professional Recovery Sequence

Step 1: Re-configure USB Security Policies

1. Click the Apple Menu and open System Settings.
2. Select Privacy & Security from the sidebar.
3. Scroll down to the Security section and locate Allow accessories to connect.
4. Change the selection to Automatically When Unlocked.

Step 2: Clear and Re-establish Hardware Authorizations

1. Unplug the tablet’s USB cable from your Mac.
2. Open Terminal (Cmd + Space, type Terminal).
3. Run the following command to reset USB system notifications:Bash sudo killall -9 com.apple.developer.driverkit.userfsd syspolicyd
4. Enter your admin password when prompted.
5. Reconnect the tablet directly to a native USB-C port on your Mac and select Allow if a banner appears.

Step 3: Verify Driver Input Permissions

1. In System Settings, navigate to Privacy & Security > Accessibility.
2. Ensure WacomTabletDriver, Wacom Center, and TabletDriver are toggled ON.
3. Go back to Privacy & Security and select Input Monitoring.
4. Verify that WacomTabletDriver is present and toggled ON. If toggles are grayed out or unchangeable, check Troubleshooting “Login Items” That Won’t Toggle Off for Adobe.

Step 4: Force-Restart Tablet Background Services

1. Open Activity Monitor (Cmd + Space, type Activity Monitor).
2. Search for Wacom in the top-right search box.
3. Select WacomTabletDriver, WacomCenter, and com.wacom.IOManager.
4. Click the Stop (X) icon at the top and select Force Quit.
5. Relaunch Wacom Center from your Applications folder to restart the background services cleanly.

Required Resource Allocation

• System Privileges: macOS Administrator password to modify hardware security policies.
• Direct Hardware Connection: A functional USB-C or Thunderbolt port directly on the host machine.
• Updated Drivers: Wacom Driver version 6.4.x or newer built natively for modern macOS releases.

Combined Symptom Escalators

• Accessory Glitch + Background Daemon Blocks: If adjusting accessory settings fails to bring the tablet online, background execution permissions are likely blocked. Review Why macOS Sequoia Blocks Adobe Background Processes by Default.
• Accessory Glitch + Photoshop Canvas Lag: If pen tracking connects but canvas movement stutters, check stylus driver interaction settings alongside GPU rendering preferences.

Final Render

Setting accessory connection policies to automatic and ensuring direct USB data passthrough restores immediate communication between your drawing tablet and macOS, getting your pen pressure and custom shortcuts back online.