There is currently a temporary issue in SessionLab where you'll be shown the below issue page when you try to export your session and save it as a PDF:

This is a know bug at the moment, and our Technical team are currently looking into fixing this as soon as possible. In the meantime, you can click on 'Print' instead of 'Save PDF' (and then save the file as a PDF as per the image) and the export will be downloaded.

However, if you're still having trouble with this workaround, please reach out to us and we'd be happy to assist.

Apologies for the inconvenience and we hope to have this resolved shortly.