My Magento store has suddenly stopped attaching content to the PDF invoices generated after each payment. The transaction itself completes, yet the resulting document downloads as a completely blank page. I haven’t knowingly installed new extensions, run an upgrade, or edited core files, so I’m unsure what triggered the fault—only that customers are now complaining and accounting is stalled. I need someone who can drop in quickly, trace the root cause, and restore full, correct PDF output without disrupting live sales. Please be comfortable digging through Magento’s sales module, PDF renderer, and any third-party libraries that might hook into invoice generation. If the issue sits in code overrides, corrupted templates, or a misconfigured payment gateway callback, I’ll rely on your expertise to pinpoint and clean it up. Deliverables • Diagnose the exact reason invoice PDFs are empty • Apply a clean, version-controlled fix (no core hacks) • Confirm PDFs render correctly across at least three real transactions • Provide a brief summary of the change so I can track it for future upgrades Quick turnaround is important; once the invoices are readable again, the job is done.