Message is displayed 'Another instance of application is already running' when opening Primus

Product(s): Measure
Applies to version: All current versions
Audience: External – Customers
Difficulty: Basic
Estimated resolution time: 5–10 minutes
Last updated: 2026-06-27
Article type: Troubleshooting guide

Quick summary

Measure shows the message "Another instance of application is already running" and will not open. This typically happens when Measure was recently closed but the PC hasn't yet released the process - often on systems with limited RAM. This guide walks you through ending the stale process and restarting.

⚙️ Before you begin

You'll need access to Task Manager (press Ctrl + Shift + Esc).

Step 1: Check whether Measure is still running in Task Manager

Is Measure visible as a running process in Task Manager?

✅ Yes → Proceed to Step 2 to end the process.
❌ No → Take these steps:

Press Ctrl + Shift + Esc to open Task Manager.
Check both the Processes tab and the Details tab to confirm Measure is not listed.
If not found, try restarting Measure - the process may have cleared. If the error persists, continue to Step 2.

Step 2: End the Measure process in Task Manager

Have you ended the Measure process in Task Manager?

✅ Yes → Try opening Measure again. If the error persists, proceed to Step 3.
❌ No → Take these steps:

Press Ctrl + Shift + Esc to open Task Manager.
Click the Details tab.
Find and select Audiology.FittingSoftware.Standalone.
Click End task to force-quit the process.
Try opening Measure again.

→ Check if the issue is resolved. If yes - you're done ✓. If no - continue to Step 3.

Step 3: Restart your computer

Have you restarted your computer?

✅ Yes → Proceed to the escalation path below.
❌ No → Take these steps:

Save any open work in other applications.
Restart your computer.
Try opening Measure again once the PC has fully restarted.

→ Check if the issue is resolved. If yes - you're done ✓. If no - proceed to the escalation path below.

🔺 Escalation path

If none of the above steps resolved the issue, contact Auditdata Support.

Please have ready:

Device model and serial number
Software version and device firmware version
Your account name and contact details
Which steps above you already tried
Any error messages or unusual behaviour observed

✅ Expected outcome

After completing these steps, the "Another instance of application is already running" message should no longer appear and Measure should open normally.

📝 Additional notes

This error is most common on systems with limited RAM - the PC struggles to release the Measure process cleanly after it closes.
Ensure your system meets the minimum memory requirements for Measure.
Keep Measure and Windows updated to the latest versions to reduce the likelihood of this occurring.
Related articles: Measure / Measure app crashing on Otoscopy module launch · Unexpected, Sudden Software Restart/Crash

Need more help? Visit the Auditdata Help Centre or contact our support team.