OSWeb image failed to load

Hello all,

We have been running an online experiment using OSWeb v2.2.9 and JATOS mindprobe servers for a while now. Recently, we received reports from a few participants stating that the experiment freezes, crashes, or occasionally fails to display certain images. We launched the study after piloting, during which none of these issues occurred. We have already reached a sample size of 30, and only recently 2-3 participants reported such problems.

I was able to replicate the issues myself. Interestingly, different browsers behave differently. Chrome does not even allow the experiment to start, and the console throws the following error message: "Failed to load resource: the server responded with a status of 404 ()", specifically for the following image files: T_NC_toy%20car.jpg, T_NC_toy%20cell%20phone.jpg, T_NC_baby%20doll.jpg, and O_NC_pencil%20case.jpg.

Firefox allows the experiment to run initially, but then it freezes, I assume when one of the problematic images is about to be presented. Opera also allows the experiment to run, but the "broken" images are simply not displayed (we can tell because the text descriptions presented below the images still appear on those trials).

I have not included the experiment script, as I suspect the issue may be related to the JATOS server or OSWeb itself. However, I can share relevant parts of the script if necessary. We are not sure what we might be missing and would greatly appreciate any help or suggestions regarding this issue.

Thank you!

P.S.: Just noticed a recent discussion noting that the latest JATOS update is stricter with filenames so spaces are not allowed. I guess this explains everything.