Webmail blank pages and login loops usually come from stale sessions, browser issues, corrupt mailbox state, or service-side errors affecting the selected webmail app.
Common symptoms
- Roundcube opens blank
- Logging in returns to the same page
- One mailbox fails while others work
Troubleshooting steps
- Clear cookies for the webmail hostname and retry in a private browsing session.
- Test another browser to distinguish local browser problems from service issues.
- Try the alternate webmail access method provided by your service, such as domain-based and client-area links.
- Confirm the mailbox credentials work and that the mailbox is not full.
- If only one mailbox is affected, test whether the issue follows the mailbox or the browser by trying from another device.
Additional notes
- A full or damaged mailbox state can produce unexpected webmail behavior for one account only.
- Browser extensions frequently break webmail interfaces.
When to contact support
Contact support if multiple mailboxes show the same blank page or loop behavior.