Hi ​@sevengates, 

Thanks for contacting Lucid Support! Just to make sure that we are on the same page, please review our UML Sequence Markup article from the Lucid Help Center, and let me know if you have any questions about the set up or intended functionality.

There are a couple of specific things worth noting when working with UML:

• The UML markup feature isn’t available to all account levels. Please see the Lucidchart Plans article for what’s available at each account level. If you are interested in upgrading please visit our Upgrade your Lucid account article.
• Our UML tool does not support the use of ref box to reference other diagrams, and does not support the use of names with spaces in them. If either of these options would be useful to you, please post your idea in the Lucid Community. These ideas will be shared with our product development team for consideration.
• If you ungroup your generated UML diagram it will be disconnected from the markup and you will be unable to edit the diagram using the markup moving forward.

Could you try opening your document in a private or incognito window to help us narrow down the potential cause? Could you also try connecting to a different network or disconnecting from your VPN (if applicable)? Sometimes account performance issues can be related to internet security/speed or browser issues. These steps will help us eliminate that possibility. For help with opening an incognito window, please see this community post (in English).

If the issue persists, please send the following information:

• A description of steps you took leading up to the issue.
• A screenshot of the associated Javascript Console output after reproducing the issue. You can open your Javascript Console by pressing Ctrl+Shift+J (if your computer is a Windows/Linux) OR Cmd+Opt+J (if your computer is a Mac).

Feel free to let me know if you have any further questions. Thanks for your help and patience!

Thank you for your reply. 

Most of the boilerplate text you wrote is not relevant to the bug I presented. None the less, here is the output of the console with the example markup with the aforementioned overlapping of note over the text of OPT grouping, that you can see right in the middle.

The window below is in incognito and without VPN connection. The Post error occurred when I clicked Build button for the markup. And below the image you can find the expanded stack for your debugging.  However, I don’t think this is relevant to how Lucidchart is rendering notes inside the OPT grouping while disregarding spacing for the grouping’s own message. I am not deeming the POST error in console relevant because I get the error when I click UML Markup to bring Alice and Bob example and also when I just change “note” text to “note2” and hit Build button again. I noted down in yellow the actions when the errors occur in console on the last image.

Hope these help.