There's a quiet frustration baked into every spreadsheet user's workflow: the moment a formula stops behaving like magic and starts acting like a stubborn gatekeeper. That's exactly what's happening with the Index Match issue described here, where updating a source workbook doesn't ripple through to the dependent file. The user has to manually click into the formula, press enter, and then either hunt down the source file or cancel, only to watch the values refresh anyway. That last detail is the tell. The data updates whether you point to the file or not, which means the formula already knows where to look. The problem isn't the lookup logic. It's the connection layer between the two workbooks, and it's stuck in a state where it demands a nudge before it trusts the link.
What's really going on is that Excel, or any spreadsheet tool in this situation, is treating the external reference like a lazy handshake. It remembers the path well enough to retrieve the data when forced, but it won't proactively check for changes unless the file is opened with full update permissions or the calculation settings are configured to refresh external links automatically. The user's experience, clicking enter, seeing the prompt, then canceling and still getting the update, shows that the formula itself is sound. The issue is that the workbook's link settings are likely set to prompt before updating, or the source file is closed in a way that breaks the automatic refresh chain. This isn't a formula error. It's a configuration gap, and it's far more common than most people realize.
The practical takeaway here is that this behavior is not something you have to live with, nor is it a sign that Index Match is failing you. It's a signal to check how your workbook handles external references. Look for the connection settings, usually found under Data or Formulas depending on the tool, and make sure "Update links on open" is enabled. Also verify that the calculation mode is set to automatic, because if it's manual, the dependent workbook won't recalculate on its own. The fact that canceling still produces the updated values suggests the source path is stored correctly, so the fix is about removing the friction, not rewriting the formula. This is a small but meaningful step toward reclaiming the flow that spreadsheets are supposed to give you.
For anyone nodding along because they've hit this exact wall, the move is straightforward: don't accept the manual re-entry ritual as part of your workflow. Open the dependent workbook, go into the connection or link manager, and adjust the update behavior so it refreshes automatically or at least asks once without requiring you to re-enter the cell. If you're using Index Match specifically because it feels more robust than VLOOKUP, this issue isn't a reason to abandon it, it's a reason to tighten the environment around it. The formula is doing its job. The workbook just needs to be told to let it. Fix that, and you'll stop babysitting your data and start actually using it.