Unexpected error after update

Hi. After updating my Kirby site from 2.4.0 to 2.4.1 I get ā€œAn unexpected error has occurredā€ error when I go to save longish posts with more than say 500 characters.

Iā€™m only using a title and textarea field and havenā€™t set any character limits. Also, Iā€™m not using any plugins and everything else seems to be working well.

Iā€™m wondering if someone might know whatā€™s happening?

Thanks

Do you use any hooks, maybe?

Is there maybe any more information in the dev console?

Could the text format be the problem?

In my console I get
POST http://mydomain.com/panel/pages/services/service-group1/service/edit

403 Forbidden
952ms

<html lang="ja">
<head>
	<title>403 error - Forbidden</title>
	<meta http-equiv="Content-Type" content="text/html; charset=EUC-JP" />
	<meta http-equiv="Content-Style-Type" content="text/css">
	<meta http-equiv="Content-Script-Type" content="text/javascript">
	<link href="/htdocs_error_Zq9kbQHobRDu8hdp4K06lMGUOLwFoY0dQUSsIqgXLVBYB3gwAIBy9NNcd9coPHRV/css/error
.css" rel="stylesheet" type="text/css">
</head>```

What do you mean with ā€œtext formatā€?

Just to make sure: Itā€™s not that you can save anything, it only happens with some pages?

This seems to be a permission problem. Have you checked the folder rights to make sure you can write to them?

Maybe also check the error log on your server, maybe there is more information in there.

Yes, it only happens with some pages and I have deduced that words in curved brackets cause the error. I can recreate the error in pages that save normally by inserting () anywhere in a textarea field.

Strangely, it seems that other characters or combinations of characters are having a similar affect. At first I wondered if characters or spaces from a Japanese word editor may be causing the problem but converting and cleaning the text made no difference.

No PHP7 errors are being logged and everything in my site and content directory is 755.

I seems some people had a similar problem before, in one case it disappeared on its own after a week, in the other case a backup was used: ā€œAn unexpected error occurredā€ when editing+saving content, even as Admin

Thanks for your help, Iā€™ll wait and see what happens.