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OpenSesame 3.3.0 released! Includes OSWeb 1.3.7 and Rapunzel 0.4.4

edited April 2020 in OpenSesame

OpenSesame 3.3.0 Lentiform Loewenfeld is a major new release with many new features and improvements. A detailed changelog is therefore not available; however, a list of most important changes can be found here:

As always, you can download OpenSesame from here:

For the first time, OpenSesame now includes Rapunzel, which is a modern code editor for numerical computing with Python and R.


  • @Daniel for extensive code contributions
  • @Cherie for updating the Chinese (zh_CN ) translation
  • @aytc for updating the Turkish (tr_TR ) translation

Known issues

  • The media_player_mpy extension is broken. This will be fixed for 3.3.1.


  • Hello,

    Thank you for the update. I downloaded Opensesame 3.3.0 (Standard Windows Installer) but now my previous OpenSesame experiments cannot be opened. I read the note "Some Python packages are not compatible with Python 3. If you want to use those, please download the Python 2.7 (64 bit) package below." but I do not know what that means or whether that could be the issue here.

    Before there was no issue of updating OpenSesame and me being able to open my previous experiments.

    Best regards,

    So So

  • HI @SoSo

    In principle, OpenSesame 3.3 should be fully backwards compatible with previous 3.X releases. That being said, if your experiments have inline_script items with Python-2-only code, you'd have to use the Python-2-backed package.

    But first things first: If you open your old experiments, what error message do you get?



  • Hello @sebastiaan,

    Thank you for your prompt reply.

    Yes, I had an inline_script with my previous experiment. So does that mean I also have to upgrade my Python to Python 3?

    I wasn't able to open my old experiment at all with OpenSesame 3.3. For now, I downgraded to OpenSesame 3.2.8.

    Also, ever since I upgraded then downgraded again, when I open OpenSesame, the icon image on my task bar below is gone (just a blank page present) but everything works fine. Should I be concerned?


    So So

  • Yes, I had an inline_script with my previous experiment. So does that mean I also have to upgrade my Python to Python 3?

    OpenSesame includes its own Python interpreter. In OpenSesame 3.2 and before this was based on Python 2.7 (in the default package). In OpenSesame 3.3, this is based on Python 3.7 (in the default package). The version of Python used by OpenSesame is independent of any other Python installations that you might have on your system!

  • edited May 2020


    I downloaded 3.3 for my windows 7 pc, and there's probably a conflict with avast, since sth was moved to "virus chest". Unfortunately I didn't take any printscreen at that moment, and avast obviously doesn't like user control since there's no log of what was blocked.

    To cut a long story short, I decided to uninstall 3.3 and install again the 3.2.8 version.

    Osexp files cannot be opened through double click, and I cannot fix this dependency. I tried to use the "Open with> choose default program" option, but I had no luck. I actually chose all 5 files (e.g., opensesame.bat) in the Program Files(86)>OpenSesame directory, but nothing worked.

    Any suggestions?

  • @fotisfotiadis It's a bit unclear from your description what happened exactly. If OpenSesame 3.3 got quarantined by the virus scanner, then it's not surprising that things don't work. But maybe there's more to it then that? If so, could you provide a clear description of what you did in which order, and in what sense things don't work as you expect them to?

  • edited May 2020

    Dear Sebastian, thank you for your immediate response.

    I'll try to be a bit more clear. I tried to install 3.3.0, not using the "run as administrator" way unfortunately. So, avast tried to first quarantine python (there was an option for that, so I didn't allow it), and then I believe it again tried to quarantine a dll file, but there was not option for me to allow this action or not, and that's why there was no time to write down the name of the file.

    Open sesame does work (both 3.2.8 and 3.3.0 versions). I can create new experiments etc. And I can also open my osexp files (in both versions) through the File>Open menu.

    But (in both versions) the osexp file are not recognized and the icon used is the windows system icon. In 3.2.8 double click does not work, and in 3.3.0 double click does open the file, but at the same time a cmd window is run (please see the png file I am attaching).

    So, python is not quarantined, OS does work, but the osexp files are not "linked" to the OS program any more.

    I hope that was a bit more clear.

    Thank you again for your time,


This discussion has been closed.

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