Refresh the page, reduce request size, try another browser/network, and disable extensions. If the issue persists, check the status page and retry later.
Extensions can interfere with scripts and streaming responses.
If the service is down, wait and retry later.
Claude · Errors & Bugs
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Claude Code versions before v2.1.34 contained two independent bugs that broke prompt caching, causing every interaction to be billed at full token cost instead of the cached rate. This inflated usage by 10 to 20 times, draining daily Pro budgets in under 20 minutes. The fix is to update Claude Code to v2.1.34 or later with 'npm update -g @anthropic-ai/claude-code'. Anthropic confirmed the bug in March 2026.
Claude Pro supports file uploads up to 10 MB per file; supported formats include PDF, Word (.docx), plain text, images (PNG/JPG/GIF/WebP), and most code files. If your attachment fails or won't process, the most common causes are an oversized file, an unsupported format, a stale browser session, or a network/extension block. Clear site data for claude.ai, disable ad blockers, and retry in incognito — that resolves the issue in the majority of cases.
A Claude blank page or white screen is almost always caused by a stale browser cache, a script-blocking extension, or a VPN blocking WebSocket connections. Open an incognito window and sign in — if Claude loads there, clear all site data for claude.ai in your main browser and disable extensions one at a time. If Claude is blank in incognito too, disable your VPN and check status.anthropic.com for active outages.
Claude's 'error loading chat' message appears when a conversation fails to sync from the server or a browser extension blocks the loading request. Refresh the page once, then try opening the conversation in an incognito window. If a specific chat refuses to load on all devices, that conversation's data may be corrupted on Anthropic's servers — start a new conversation to continue your work.
Report Claude bugs at support.anthropic.com. An effective bug report includes: the exact error message, the specific steps that reproduce it (not just 'it stopped working'), your browser and OS version, whether it happens in incognito, and whether it affects all conversations or just one. Including a screenshot and the approximate timestamp speeds up resolution significantly.
Claude stopping mid-response is usually caused by a network interruption, a browser extension blocking the streaming connection, or the response hitting a length or usage limit. The fastest fix is to refresh the page, disable extensions, and retry with a more focused request. If Claude consistently stops at the same point in a response, the content itself may be triggering a safety check — try rephrasing the request.