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How should I clear cookies and cache? EDC/CDMS

Updated

When you browse the web, your browser stores temporary files, scripts, and cookies locally (in its cache) to load pages faster. Occasionally, an outdated cached file or cookie can cause display glitches, login loops, or slowness in Castor EDC/CDMS. Clearing your cache and cookies resolves most of these issues.

 

Important: Supported Browsers Policy
Castor EDC/CDMS officially supports the following desktop web browsers:

  • Google Chrome (latest 12 major versions)
  • Microsoft Edge (latest 12 major versions)
  • Mozilla Firefox (latest 12 major versions)
  • Apple Safari (current and previous major version on macOS)

Unsupported browsers (such as Opera, Brave, Vivaldi, and Internet Explorer) are not supported. Attempting to use an unsupported browser may result in degraded functionality or automated access blocking. If you are experiencing issues on an unsupported browser, please switch to Chrome, Edge, Firefox, or Safari. For more details, see What internet browsers do you support?.

 

Quick Tip: Try a "Hard Refresh" First

Before clearing your entire browser history, you can often resolve caching issues on the current page with a hard refresh:

  • Windows / Linux: Press Ctrl + F5 (or Ctrl + Shift + R)
  • Mac: Press Cmd + Shift + R

If the issue persists, follow the steps below for your browser.

 

1. Google Chrome

Option A: Clear Cache and Cookies for Castor Only (Recommended)

This method resets Castor without logging you out of your other websites:

  1. While on your Castor study page (data.castoredc.com, us.castoredc.com, uk.castoredc.com, or au.castoredc.com), click the View site information icon (the sliders / tune icon) to the left of the URL in the address bar.
  2. Click Cookies and site data.
  3. Click Manage on-device site data.
  4. Click the trash bin icon next to the Castor domain(s) to remove them.
  5. Click Done and reload the page.

Option B: Clear All Browser Cache & Cookies

  1. Press Ctrl + Shift + Delete (Windows) or Cmd + Shift + Delete (Mac).
  2. Set the Time range to All time.
  3. Check Cookies and other site data and Cached images and files.
  4. Click Clear data.

 

2. Microsoft Edge

Option A: Clear Cache and Cookies for Castor Only (Recommended)

  1. In the address bar while on Castor, click the Lock / Site info icon next to the URL.
  2. Select Cookies.
  3. In the popup window, select the castoredc.com folder and click Remove.
  4. Click Done and refresh the page.

Option B: Clear All Browser Cache & Cookies

  1. Press Ctrl + Shift + Delete.
  2. Set the Time range to All time.
  3. Check Cookies and other site data and Cached images and files.
  4. Click Clear now.

 

3. Mozilla Firefox

Option A: Clear Cache and Cookies for Castor Only (Recommended)

  1. While on the Castor website, click the Padlock icon to the left of the URL address bar.
  2. Click Clear cookies and site data….
  3. In the confirmation dialog, click Remove.
  4. Refresh the page.

Option B: Clear All Browser Cache & Cookies

  1. Click the menu button (three horizontal lines) in the upper-right corner and select Settings.
  2. Select Privacy & Security on the left menu.
  3. Scroll down to the Cookies and Site Data section.
  4. Click Clear Data….
  5. Ensure both Cookies and Site Data and Cached Web Content are checked.
  6. Click Clear.

 

4. Apple Safari (macOS)

Option A: Clear Cache and Cookies for Castor Only (Recommended)

  1. In the top menu bar, click Safari > Settings (or Preferences).
  2. Select the Privacy tab.
  3. Click Manage Website Data….
  4. In the search box in the top right, type castoredc.
  5. Select the Castor domains that appear and click Remove.
  6. Click Done, close Settings, and refresh Safari.

Option B: Clear All History and Cache

  1. In the top menu bar, click Safari > Clear History….
  2. In the dropdown, choose all history.
  3. Click Clear History.

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