You can change it. For example Contact Form 7 uses wp-contents/uploads/wpcf7_captcha/ by default.
had a quick browse through code and looked at the readme. where can I change this setting?
strangely, this started happening when updating versions. it failed, and the plugin was deleted. after re-installing, the tmp folder lost it’s permissions (assuming that’s where it previously used, can’t remember).
So what plugin are you using? Really Simple CAPTCHA is a framework, it doesn’t work alone. If you use Contact Form 7 with it, it uses wp-contents/uploads/wpcf7_captcha/ by default, as I wrote, so you don’t need to change the setting.
I’m using it in a private plugin. I had look at the source again and I notice the ReallySimpleCaptcha::tmp_dir property. I suppose if I modify that after instantiation that’ll work?
OK. Yes, that’s right. Check how Contact Form 7 initializes ReallySimpleCaptcha object in it and assigns tmp_dir property.
http://plugins.trac.ww.wp.xz.cn/browser/contact-form-7/tags/2.4.3/modules/captcha.php#L297
i see it. thanks for pointing that out.