Just upgraded my working 2.4.9 site to 2.4.13 and now all the cms checkboxes appear with little green blocks after them.
Looks like some sort of validation gone wrong - the only things changed were the cms and sapphire folders - help !!!!
If it helps ....
$messageblock in checkboxField has class = "message " in it after each checkbox field!
The same issue with my upgraded site too! I have not yet found the time to investigate the issue, but I'm also not a hard core SS developer and so far what I have found is what you have just described: now we have lots of class = "message " attributes of empty span tags in the standard forms, basically empty messages. An example can be seen in the middle of this page: http://pestbudakarate.hu/Security/login
Thank you for the quick fix, worked fine! Someone should share it with the dev team via firstname.lastname@example.org, so that it gets noticed somehow. I do not think they have too much time reading the forum, do they?
It's true, core devs don't seem to be hanging around here as much as before. Used to be these forums were about the only source of information on SilverStripe but that is no longer the case.
But if you find a bug in SilverStripe, or better, if you found out what's causing it and even have a fix, like here, the place to be is on GitHub, where you can create an issue to report a bug - or offer a solution if it has already been reported: https://github.com/silverstripe/silverstripe-framework/issues.
Be sure to mention the version. A pull request might even be better, depending on your experience with Git(Hub). Read more about contributing here: