Greetings! I've got an new install of 2.4.1 running on a live server (1and1), but the WYSIWYG editor pulls a no page can be displayed in the popup window, though only on content pages, the template wysiwyg works fine. I ignored it for a while because I was running inline css and thought that was the problem, but linked css didn't fix it either. Any ideas? Maybe a permissions thing I missed somewhere? Any help is appreciated.
Welcome to the Forum austinsa. If you suspect it is a permission problem, give the admin folders full read permssion and see what happens. If the problem is still there, you'll know to look elsewhere.
It may be useful to have a look at your setup and install. Send a PM with your access details and I'll have a look for you.
Keep at it - I'm sure it's something rather basic.