ChatGPT cannot open, login fails, network error, file upload, image generation.
ChatGPT issues cluster into three buckets: network (region / proxy / Cloudflare), account (login / verification / suspicious activity), and features (image / file / Plus). Each article here fixes one specific symptom, not generic "tips".
Advanced Voice is gated by account country, plan tier, and app version. Most 'not available' errors trace to a stale client, a lapsed plan, or — on Mac — the desktop app's retired voice feature.
Uploaded files vanish from a ChatGPT chat after reload and you see "This file is no longer available." Recover the content, re-attach fast, and use the Library so it stops happening.
Code Interpreter kills your Python job halfway with 'execution timed out' — usually a CPU-bound loop, hung network call, or memory spike inside the ~120s, ~1GB sandbox. The fast fix: split into checkpointed cells.
Long ChatGPT thread starts forgetting earlier turns. Usually the model's context window filled up, attachments are eating tokens, or you got routed to a smaller-window tier. Diagnose and fix, with exact June 2026 token limits.
Custom Instructions are saved but ChatGPT ignores them mid-chat. Usually a Project override, a Memory conflict, context overflow, or a silent model switch. Make them stick.
Your Data Controls export never emails a ZIP, the ZIP is empty, or it downloads corrupted. Find which link in the chain broke and recover your full archive.
You started in GPT-5.5 and answers suddenly feel shallower — the auto router quietly downgraded you, usually because of cap pressure, tool routing, or a regenerated reply.
A shared ChatGPT Business or Enterprise Project isn't in your sidebar. Usually you joined after it was shared, you're on the wrong workspace, or the Pinned section is collapsed. Find it and fix it.
ChatGPT stopping mid-output is usually the response length budget, a structural stop the model chose, or a dropped stream. Type continue first, then fix the real cause.
Your ChatGPT Task should have run at 9am but the inbox is empty. Account timezone drift, an auto-paused Task, or a lapsed Plus plan are the usual causes — here is the fix order.
The reply streams half a sentence then freezes. Usually a dropped SSE connection, a backgrounded tab, or a backend hiccup. Refresh first, then diagnose by bucket.
A conversation shows on the web but is missing in the app (or vice versa)? The cause is almost always a mismatched account or workspace, not lost data. Here's how to find which one in under two minutes.
Click a Custom GPT and get a blank screen, or its action returns 'request failed'? Nine times out of ten it's cache, account access, or the creator's action backend. Here's how to tell which.
Sidebar empty? 9 times out of 10 the chats aren't gone — wrong account, Temporary Chat, archived, or a stale tab. Walk this checklist before assuming loss.
ChatGPT says "got it" then forgets next session? It's usually a toggle, Temporary Chat, a write that never happened, or the new background memory. Check these and fix it.
Hit the "You've reached your limit" wall in ChatGPT? Here's what the rolling cap really means, the fastest way back to work, and how to stop hitting it.
Upload a PDF and ChatGPT says it sees nothing or 'No text could be extracted' — almost always scan-vs-text, size, or encryption. Fastest fix inside.
A chatgpt.com/share link 404s or shows blank? It's almost always sharer-side — deleted, policy-removed, or never created. Here's how to tell which, fast.
Voice silent, stuck on Connecting, or the waveform button missing? It's almost always microphone permission, the wrong input device, a stale build, or the retired macOS-app voice.
ChatGPT search spins forever, returns no sources, or refuses to browse? Here's how to force it, plus the six reasons it silently fails.