Invalid Image Code

It seems now that every time I try to submit a screenshot, I get an "Invalid Image Code" message. I'm about 90% certain that I got the captcha code correct at least once in the 6 times I tried to submit the image so I'm wondering if this error comes up when images are too large also? Who knows, maybe I "can't read gud". The image is not large and it does not go over the filesize limit. Just a bug perhaps?