As part of the anti-spam measures implemented for the site, when a member creates a new forum topic - and by that I mean the original post, not the subsequent replies - one of the items shown below should appear at the bottom of the form just above the "Save" button...
 

 

So far, three members have reported getting an error message after clicking/tapping "Save" indicating that they have not responded correctly to the Captcha field, yet neither of the two fields shown above were present on the form.

If anyone else has had this issue, please let me know here in this thread.  Please include all pertinent information, including the type of device you are using, its OS, which browser(s) you've tried, as well as the country you were connecting from.  And if you have more than one computer/device, please try it on all of them and report the results as well, even for the ones that worked as expected.