i use the captcha image, but sometime the image shows "incompletely"
e.g. it does not show the full image, it is just chopped

it happened randomly

my form also have an ajax link to allow refresh the captcha immediately
if i click the ajax link to refresh the image , the image chops randomly
with random extent, to the worst, sometime it shows broken image

both jetty/tomcat can have the above problem

any hint that can help further trouble shoot the problem?


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