9.1.18

Bugfix

• The Basic Captcha dot counting challenge could ask for more dots than it had room to draw, leaving around a third of its challenges impossible to answer (#640).
• The Basic Captcha dot counting challenge now always includes dots in other colors, instead of sometimes filling every slot with the color being counted.
• [security] The Basic Captcha position challenge accepted any word as its answer, so it let every submission through.
• The Basic Captcha type selected in the plugin settings was ignored and always fell back to random characters.
• The Basic Captcha math challenge produced an unanswerable puzzle when division was the only chosen operator.
• A Basic Captcha math challenge whose answer is zero, such as 7 - 7, was rejected as though no answer had been given.
• Basic Captcha character challenges containing a lowercase "x" ignored the configured image size, colors and text position.

Improved

• The dot counting challenge's grid size and the range of dots to count can now be configured.