A totally blank page after the sandbox ad could mean that your experiment website is broken. The psiturk ad server tries to fetch your public ip and uses that as the place to send participants to after the ad. So if your experiment isn't accessible from that public ip, then the psiturk ad server approach won't work. You can do ssl yourself instead of using the psiturk ad server and specify your own ad_url to get around that, see the psiturk 2 docs. Also check your javascript console for errors, or check your ad blocker, etc etc.
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