Claude Troubleshooting Practical Checklist: White Screen, Model Switching Failures, and History Desync

When using Claude, the most annoying thing isn’t slow answers—it’s the page suddenly turning white, buttons becoming unclickable, and past conversations disappearing. The following Claude troubleshooting checklist is written in the order of “first determine whether it’s a server-side issue, then handle the local environment,” and it can basically help you quickly pinpoint common anomalies.

First confirm whether it’s server-side instability: don’t waste effort locally

The first step in troubleshooting Claude errors is to determine whether the problem is happening only on your end. You can first switch networks or devices and open the same account to see whether it gets stuck in the same way; if multiple endpoints are abnormal, it’s usually server congestion or a brief outage.

When you encounter a busy message or endless loading spinner, the most effective approach is often to “wait a bit and try again,” rather than repeatedly refreshing. High-frequency retries may trigger temporary risk controls, making the issue seem more complicated.

White screen, greyed-out buttons: prioritize cache and extension conflicts

If Claude’s web app shows a white screen, the sidebar doesn’t display, or the send button is greyed out and unclickable, common causes are corrupted cache or browser extensions blocking scripts. It’s recommended to open it in an incognito window first, then disable ad blockers, script managers, and privacy-protection extensions one by one for comparison.

If incognito works normally, it’s faster to clear site data in your regular window: delete Claude-related cookies and cache, then log in again. After this step, you can usually complete an effective closed loop of Claude error troubleshooting.

Model switching fails or the dropdown can’t be selected: check the network and session state

If the model dropdown won’t open, or it switches and then jumps back to the original model, it’s mostly related to network middle layers—such as a corporate proxy, DNS pollution, or an unstable acceleration route. First try turning off the proxy/accelerator and switching to a mobile hotspot to confirm whether the network path is causing resource-loading failures.

Also, leaving the page open without activity for a long time can cause the session state to expire, showing up as “seems online but actions don’t take effect.” Refreshing the page, re-entering the conversation, and then switching models is a more reliable Claude troubleshooting method.

History not syncing or disappearing: don’t assume data is lost

If conversation history occasionally doesn’t show, it’s commonly due to sync delays or filtering states that make it “invisible.” First confirm whether you switched to a different workspace or a different account entry point, then try logging out and logging back in—history often comes back in many cases.

If only one browser can’t see it, it’s usually still a local cache or extension issue; handle it using the methods above. Treat “cross-device comparison + clearing site data” as a standard Claude troubleshooting routine for the highest efficiency.

Content rejected or unable to send: shift the problem from “sensitive” to “clear”

If you find that you can’t send after typing, or you get a message that the content isn’t supported, don’t rush to switch accounts. Rewrite the request to be more specific: state the purpose, constraints, and boundaries, and avoid being misclassified as high-risk intent—this often gets it through.

If you’re indeed doing compliant content but still get blocked frequently, it’s recommended to split the task, reduce the length of one-shot instructions, and minimize the “templated traces” caused by copy-pasting. This kind of handling is also part of Claude troubleshooting, and it’s more effective than brute-force retries.