[21:48] <Coen_Eisma> I have Limesurvey installed. Everything works great, except for the file upload. When I hit the button 'Upload file' I get the message "You don't have a valid session !". Anybody got an idea how I can solve this ?
[21:58] <Mazi> Coen_Eisma, which Limesurvey version did you install?
[21:59] <Coen_Eisma> Hi Mazi. 1.92+ Build 120711
[21:59] <Mazi> you can try to export your survey and import it at our demo to see if you can reproduce the problem (which is most probably server setting related): demo.limesurvey.org/admin
[21:59] <Mazi> username: admin
[21:59] <Mazi> PW: test
[21:59] <Coen_Eisma> Great! I'll give that a try!
[22:03] <Coen_Eisma> It works on the demo-site, so - as you predicted - it must be a server setting issue
[22:08] <Coen_Eisma> any idea what it could be?
[22:16] <Mazi> Coen_Eisma, there are some session issues listed here: docs.limesurvey.org/Installation+FAQ&str...tions+for+LimeSurvey
[22:16] <Mazi> problem might depend on file size, depending on the server configuration.
[22:16] <Mazi> the Limesurvey forums should also contain some topics about it, use the search feature or google
[22:17] <Mazi> ...and check for the suhosin module on your server.

Opgelost! Vraag me niet waarom het werkt, maar het werkt. Ik heb bij de desbetreffende vraag de maximale bestandsupload vergroot naar 2048 (ipv de 1024 die stond ingesteld), en nu werkt alles zoals het hoort.

Nickko, dank voor je input. Ik kan weer verder.