Please help us help you and fill where relevant:
LimeSurvey version: 6.16.17
Own server or LimeSurvey Cloud: own server hosted on Infomaniak
Survey theme/template: anything that needs to upload images and use KCFinder. example: image select multiple choice.
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Since I updated to this version (and PHP8.4) i can't use KCFinder.
It appears like this and not possible to upload (see attached image).
help!

 

UPDATES:
1 - I updated to version 6.17.2. No changes.
2 - I was using Firefox. I tried Safari. Same issue, and it gives me an error message while already in KCFinder: "O Safari não consegue abrir a página porque o endereço não é válido" [translation: Safari cannot open the page because the address is invalid]

The issue is most probably with PHP 8.4.

www.limesurvey.org/manual/Installation_-_LimeSurvey_CE

PHP version requirements:
LS 7.x from PHP 8.1.29 and up
LS 6.x from PHP 7.4.x to 8.3.x
LS 5.x from PHP 7.2.5 to 8.0.x
LS 3.x from PHP 5.5.9 to 7.4.x

PHP 8.4 seems not to be supported by LS 6.x.

thank you!
I changed to PHP8.3.
unfortunatelly it doesn't work...