Happen to see this message as a response to your request to save a Confluence page?

And this in the log on the server?

com.mysql.jdbc.MysqlDataTruncation:
Data truncation: Data too long for column 'STRINGVAL' at row 1

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You may have hit CONFSERVER-52504 where the number and order of the macros on your page hits the magic number to prevent Confluence from saving your page.

This is an issue for pages with a larger number of macros. Since the projectdoc Toolbox provides blueprints that already employ a large number of macros, chances are that you hit this problem sooner.