Shortly after the release of v5.2.4 we discovered some backwards compatibility issues with changes to the default core stylesheet that had not been properly communicated. While these are only visual differences that do not affect functionality, we believe that it is best to make a new bug fix release that reverts these changes.
Accordingly, everyone is encouraged to upgrade to the new version. You can upgrade your existing single file wikis here:
https://tiddlywiki.com/upgrade.html
For Node.js users, the new version is available on npm at https://www.npmjs.com/package/tiddlywiki
See the post about the v5.2.4 release to learn about the new features: