So we've run a couple studies and are running into an issue where inquisit will variably have trouble exporting url parameters from within the script. Both studies use Amazon's Mturk and redirects participants to the inquisit study. In the first study, we redirect participants to the default finish page and have it display their subject ids as confirmation codes. For half the participants, this works it and it outputs their randomized confirmation code correctly. For the other half, however, they all receive this string: "%3C%25script.subjectid%25%3E".  

In the second study, instead of using the default finish page, we redirect to a short qualtrics survey, and export multiple url parameters.
(e.g. redirecting to http://rotman.az1.qualtrics.com/jfe/form/XXX?mturkcode=<%values.mturkcode%>&subjectid=<%script.subjectid%>&groupid=<%script.groupid%>.

Again, for half the participants, this works and all values are exported correctly. But for the other half these come out as:
mturkcode = "%3C%values.mc%%3E"
subjectid = "%3C%script.subjectid%%3E,X" (where X is the participant's actual subjectid.)
groupid = "%3C%script.groupid%%3E"

Note that by far the most interesting of these is the subjectid, which always records the incorrect placeholder first, and the correct id second. Normally it records the participants correct subjectid twice (so it would be  "X,X").

Both scripts work fine offline, and different versions of both were used on mturk online earlier this year and did not show any of these issues. This appears to indicate that a recent update may have effected how inquisit exports such parameters? If you have any advice it would be much appreciated!

Cheers!

Not sure what's causing this ("For half the participants, this works it and it outputs their randomized confirmation code correctly. For the other half [it doesn't work]" is especially odd), but I can certainly think of a workaround for the confirmation code case. The trick would be to set the finish URL directly in the script, i.e.:

#1: Add a <text> element specifying the finish page to the script like so

<text finishpage>
/ items = ("https://www.millisecond.com/web/finish5.aspx?IQConfirmationCode=<%script.subjectid%>")
</text>

#2: Set the defaults.finishpage property /onexptbegin:

<expt>
/ onexptbegin = [
    defaults.finishpage = text.finishpage.item.1;
]
...
</expt>

I don't quite understand the 2nd case you described, especially this part:

"subjectid, which always records the incorrect placeholder first, and the correct id second. Normally it records the participants correct subjectid twice (so it would be  "X,X")."

What I can't glean from your description is where the two instances of the subject id come from in the first place. Would you be able to shed some additional light on that, please?

Come to think of it, though, as an immediate fix, the same workaround should work for the 2nd case, too. I.e. if you specify

<text finishpage>
/ items = ("http://rotman.az1.qualtrics.com/jfe/form/XXX?mturkcode=<%values.mturkcode%>&subjectid=<%script.subjectid%>&groupid=<%script.groupid%>")
</text>

with

<expt>
/ onexptend = [
    defaults.finishpage = text.finishpage.item.1;
]
...
</expt>

in that script, the various query parameters _should_ be populated correctly for all participants and included in the redirection to Qualtrics.

Alright. I spent some time some time playing with getting the second study working. It looks your solution works for subjectid, but not for groupid or other values. I added the following code to my experiment:

<text finishpage>
/ items = ("http://rotman.az1.qualtrics.com/jfe/form/XXX?mc=<%values.mc%>&groupid=<%script.groupid%>")
</text>

<expt>
/ blocks = [1=ArcheStereotypeSelect; 2=Consent; 3=Instructions; 4=ArcheStereotype]
/ onexptend = [
values.completed=1; values.mc = rand(10000,99999)
]
/ onexptend = [
  defaults.finishpage = text.finishpage.item.1;
]
</expt>

Then I set the online study to redirect to an external website (If i tell it to redirect to the default webpage, it will do that instead of redirecting me to qualtrics). I used the URL "http://rotman.az1.qualtrics.com/jfe/form/XXX" (it won't work if i don't have this base URL right. For example if i redirect to "http://rotman.az1.qualtrics.com," no dice.). It will redirect me to:

         http://rotman.az1.qualtrics.com/jfe/form/XXX?subjectid=<%script.subjectid%>,

but not:

         http://rotman.az1.qualtrics.com/jfe/form/XXX?<%values.mturkcode%>&subjectid=<%script.subjectid%>&groupid=<%script.groupid%>.">http://rotman.az1.qualtrics.com/jfe/form/XXX?<%values.mturkcode%>&subjectid=<%script.subjectid%>&groupid=<%script.groupid%>.

Playing with this some more, it looks like if i redirect to:

         http://rotman.az1.qualtrics.com/jfe/form/XXX?mc=<%values.mc%>&groupid=<%script.groupid%>

I can get the subjectid to be exported correctly, since the script will insert this value into the url, such that it reads:

          http://rotman.az1.qualtrics.com/jfe/form/XXX?mc=<%values.mc%>&groupid=<%script.groupid%>&subjectid=<%script.subjectid%>

But since it does nothing with the other values, it seems i can't do anything with those. Any tips? Let me know if you would like more information (the full script, etc).