CANNOT open any project!!!

I’m on it. Here’s a fast, step‑by‑step triage for Trader’s “cannot open any project” issue. Do these in order and tell me exactly where it fails and what you see.

Quick checks (rule out widespread or local issues)

• Open QuantConnect in a private/incognito window and try creating/opening a brand‑new empty project: New -> Project -> Basic template. If that opens, the issue is likely project- or cache-specific.
• Try a different browser (Chrome, Edge, or Firefox) and, if possible, a different network (e.g., phone hotspot) to rule out corporate firewalls or DNS.
• Sign out, then sign back in. Also confirm the system clock is accurate to within a minute.

Browser reset (most common fix)

• Hard refresh the IDE page: Ctrl+F5 (Cmd+Shift+R on Mac).
• Clear site data for quantconnect.com:
  • Chrome/Edge: Click the lock icon -> Site settings -> Delete data (or chrome://settings/siteData and search quantconnect).
  • Firefox: Settings -> Privacy -> Manage Data -> search quantconnect.com -> Remove.
• Disable all extensions (especially ad blockers/privacy tools). In Chrome, test incognito with Extensions disabled by default.
• Ensure your browser allows WebSockets and doesn’t block quantconnect.com or cdn.quantconnect.com.

Organization, permissions, and subscription

• In the top‑left Org switcher, make sure you’re in the correct Organization.
• Verify your role has permission to open projects and your subscription is active. If your plan lapsed, some features can be restricted.

Test for project‑specific corruption

• From the Projects page (without opening the project), click the three dots on a project -> Duplicate, then try opening the duplicate.
• If the duplicate opens, the original likely has heavy startup content. From the file browser (without executing):
  • Temporarily rename or remove very large data files (CSV/ZIP/feather/parquet) in the project.
  • If there are notebooks that auto-run heavy cells on open, rename the .ipynb files (e.g., add .disabled) and try opening again.

Capture diagnostics for us (so we can pinpoint the cause)

• Open DevTools before trying to open a project:
  • Windows/Linux: Ctrl+Shift+I; macOS: Cmd+Opt+I.
• Console tab:
  • Check “Preserve log.”
  • Attempt to open a project; copy the first error message (red text) you see.
• Network tab:
  • Check “Preserve log.”
  • Attempt to open a project; look for any requests with status 4xx/5xx or “(failed)”/timeout, especially to api.quantconnect.com or cdn.quantconnect.com.
  • Right‑click inside the request list -> Save all as HAR with content.
• Note the exact UTC timestamp when you tried (e.g., 2025‑10‑27 18:42 UTC), your browser + version, OS, and whether it happens for all projects or only some.

Reduce heavy startup content (if opening partially works then stalls)

• Remove or move out of the project any multi‑GB files or large directories.
• If a specific file tree path is huge (e.g., data/ or results/ with many artifacts), temporarily rename the folder so the IDE doesn’t enumerate it on load.

If it still fails after the above

• Send me:
  • Your QC username, Organization name, and whether it affects all users in the org.
  • One or two affected project URLs/IDs.
  • Exact UTC timestamps of attempts.
  • The HAR file and the first 10 lines of Console errors.
  • Screenshot of what you see (spinner, error banner, blank page, etc.).
• Or submit a support ticket via Help -> Contact Support with the same details; include the HAR/console logs.

Let me know: 1) Which step first fails (incognito/new project/other browser). 2) Exact error text or console error snippet. 3) Your browser + version and OS. With that, I can zero in on whether this is cache, org/permissions, a project artifact, or a platform-side issue and guide the next fix.