Version 11.0 is a big release, but the breaking changes in it are small and narrow. I don't expect most of you to notice any of them — this post exists so you can check the list in under a minute and get back to work.

shape=plaintext is no longer automatic

In v10.5 and earlier, any node with an HTML-like label and no other style attributes automatically got shape=plaintext. I've intentionally dropped that implicit override in v11.0, in favor of a truer, unopinionated Graphviz experience — Graphviz's own default shape now applies unless a style says otherwise.

Who's affected: Anyone with HTML-like node labels who never explicitly set a shape. I expect very few of you to notice.

What to do: If a node's appearance changes after upgrading, add shape=plaintext explicitly — either as a style attribute or a row-level extra attribute.

Error reporting moved off the data worksheet

Row-validation errors used to be written into a dedicated "error message" worksheet column, shown and hidden around each generation run. Version 11.0 instead builds a localized message and routes it through the console or a message box, and the worksheet error-message column has been removed entirely.

Who's affected: Anyone with automation or muscle memory built around that worksheet column.

What to do: Check the Console tab or your message-box preference for validation errors going forward. The ! indicator in column 1 is still there to flag rows with a detected error.

Internal cleanup, no visible effect

I tightened ribbon callback functions from public to private scope so they no longer clutter Excel's Assign Macro dialog, and removed leftover linter-suppression comments. Neither change affects how the ribbon or any feature behaves — listed here only for completeness.

Progress bar code removed

The progress bar shown for long-running operations in older versions was turned off back in v10.3 and left dormant since. I've now removed the unused code.

One thing that isn't breaking: your Exchange files

If you use Workbook Exchange to version-control styles and settings, older export files — including ones using the pre-v11.0 Suffix-based cluster naming — still import correctly. Everything new in v11.0 round-trips automatically going forward.

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That's the whole list. See the full changelog for the complete picture of what's new, and open a GitHub issue if anything here catches you by surprise.