Indico pages hung up

Hello, as of this morning our indico is not working properly. In particular events’ timetables are not generated: the “Building timetable” is shown but it is spinning forever and nothing is rendered. See, e.g., Theory Service for the Low Energy Nuclear Physics Community: a Hands-on Workshop (7-9 July 2025): Timetable · ECT* Indico.
Similarly when looking at the Events > Workshops and Collaboration Meetings (Workshops and Collaboration meetings · ECT* Indico), the list gets generated but when one requests to see future or past events again nothing is rendered.
I checked that there is free space on the disk, and I do not see anything particularly off on the server. I have also restarted the machine to no effect. I see some Apache errors, stuff like:

[10/Jun/2025:11:43:46 +0200] “GET /event/236/contributions/5647/Web/ HTTP/1.0” 404
[10/Jun/2025:11:43:48 +0200] “GET /wp-content/uploads/2021/01/Web/ HTTP/1.0” 404
[10/Jun/2025:11:43:48 +0200] “GET /wp-content/et-cache/global/Web/ HTTP/1.0” 404

but I cannot correlate these with what is happening.
Any idea/pointers?
Thanks!

Do you have some cache in front of it? When loading e.g. https://indico.ectstar.eu/assets/js-vars/global.js with Chrome it has some garbage characters at the end…

According to my lords and masters, we do not have any cache mechanism. In addition they told me that the js file looks ok in Firefox, and when opened with an hexadecimal editor. So they are a bit lost as well…