If the Qwen interface freezes on a blank screen or the spinner never stops, start with the basics: hard-refresh the page (Ctrl+Shift+R on Windows, Cmd+Shift+R on Mac), clear your browser cache, and try a different browser. Chromium-based browsers tend to work most reliably. If nothing helps, check whether the servers are responding — sometimes the issue is on their end.
A failed login usually comes down to one of a few things:
If the send button does nothing or the message just hangs, the most common culprit is a dropped WebSocket connection. Reload the page and check your internet connection — even brief packet loss can break the real-time channel. If you're on Wi-Fi, switching to a wired connection or mobile data often resolves it instantly.
Qwen stops generating mid-sentence when the connection drops or the browser tab goes idle. Keep the tab active, disable aggressive power-saving modes on laptops, and make sure your browser isn't throttling background tabs.
Supported formats are JPEG, PNG, PDF, and a few others — anything outside that list will silently fail. Also check file size: uploads over the limit get rejected without a clear error message. If the format and size are fine but the upload still hangs, try a different browser or disable extensions that intercept network requests.
Slow reply times during peak hours are usually server-side, but your setup can make things worse. A congested Wi-Fi channel, a router that needs a reboot, or too many open tabs eating RAM all add up. Run a quick ping test to rule out local network issues before assuming the problem is with the service itself.
If the chat UI becomes unresponsive after a long conversation, the page has likely accumulated too much DOM content. Simply open a new chat — this resets the state and frees up browser memory without losing your history.