When using Claude Opus 4.6, if you run into endless loading with no output, failed sends, or attachments that won’t load, it’s usually not because “the model is broken,” but because restrictions are being triggered by your network, browser, or permissions. Below is a reusable troubleshooting flow for the most common scenarios, designed to help you pinpoint the cause and restore the conversation within minutes.
Start with three quick checks: is it the network, the account, or the page?
Step one of troubleshooting is to switch networks: prioritize a stable wired connection or a mobile hotspot, and avoid corporate proxies/public Wi‑Fi that can cause connection drops. Step two is to open an incognito window and log in once, bypassing old cache and problematic extensions. Step three is to see whether all conversations are affected: if only a specific chat is stuck, it’s usually caused by that chat’s context or an attachment and needs to be handled separately.
Message send failures or endless loading: tackle the “content” and the “conversation”
If it keeps loading after you send, start by shortening what you type: turn long paragraphs into bullet points, or send a single line like “First, confirm you can reply,” then add the rest in chunks. If it contains lots of code blocks/tables/long links, remove them first, then add them back one by one to find the trigger. If it still doesn’t work, start a new chat and paste in the core instruction; many “stuck conversations” recover immediately in a fresh thread.
