I have a user reporting the following error when she tries to add a question to a new group. I am able to dublicate the problem on Chrome and Firefox. I do not see any errors in the error_log or access_log. I am running Limesurvey 4.3.2+200629 on RHEL 7 with apache 2.4.6 and php 7.2.31

Any idea what could be happening?

Notice: Unknown: file created in the system's temporary directory in Unknown on line 0

Warning: Cannot modify header information - headers already sent in Unknown on line 0
{"success":false,"message":"The CSRF token could not be verified.","error":{"code":400,"type":"CHttpException","errorCode":0,"message":"The CSRF token could not be verified.","file":"\/var\/www\/html\/limesurvey\/framework\/web\/CHttpRequest.php","line":1378,"trace":"#0 \/var\/www\/html\/limesurvey\/framework\/base\/CComponent.php(561): CHttpRequest->validateCsrfToken(Object(CEvent))\n#1 \/var\/www\/html\/limesurvey\/framework\/base\/CApplication.php(212): CComponent->raiseEvent('onbeginrequest', Object(CEvent))\n#2 \/var\/www\/html\/limesurvey\/framework\/base\/CApplication.php(183): CApplication->onBeginRequest(Object(CEvent))\n#3 \/var\/www\/html\/limesurvey\/index.php(182): CApplication->run()\n#4 {main}","traces":[{"file":"\/var\/www\/html\/limesurvey\/framework\/base\/CComponent.php","line":561,"function":"validateCsrfToken","class":"CHttpRequest","type":"->","args":[{"sender":{"defaultController":"surveys","layout":"main","controllerMap":[],"catchAllRequest":null,"controllerNamespace":null,"name":"LimeSurvey","charset":"UTF-8","sourceLanguage":"en_us","localeClass":"LSYii_Locale","preload":["log"],"behaviors":[]},"handled":false,"params":null}]},{"file":"\/var\/www\/html\/limesurvey\/framework\/base\/CApplication.php","line":212,"function":"raiseEvent","class":"CComponent","type":"->","args":["onbeginrequest",{"sender":{"defaultController":"surveys","layout":"main","controllerMap":[],"catchAllRequest":null,"controllerNamespace":null,"name":"LimeSurvey","charset":"UTF-8","sourceLanguage":"en_us","localeClass":"LSYii_Locale","preload":["log"],"behaviors":[]},"handled":false,"params":null}]},{"file":"\/var\/www\/html\/limesurvey\/framework\/base\/CApplication.php","line":183,"function":"onBeginRequest","class":"CApplication","type":"->","args":[{"sender":{"defaultController":"surveys","layout":"main","controllerMap":[],"catchAllRequest":null,"controllerNamespace":null,"name":"LimeSurvey","charset":"UTF-8","sourceLanguage":"en_us","localeClass":"LSYii_Locale","preload":["log"],"behaviors":[]},"handled":false,"params":null}]},{"file":"\/var\/www\/html\/limesurvey\/index.php","line":182,"function":"run","class":"CApplication","type":"->","args":[]}]}}

In the course of troubleshooting this, I now have the errors down to these two but questions still cannot be saved. However they can be imported.

Notice: Unknown: file created in the system's temporary directory in Unknown on line 0

Warning: Cannot modify header information - headers already sent in Unknown on line 0

Here are the sources of the errors:

[Wed Jul 22 15:30:29.777389 2020] [php7:notice] [pid 2702] [client 192.168.150.61:5065] PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0, referer: example.com/limesurvey/index.php/questio...ideMenuTab=structure
[Wed Jul 22 15:30:29.803632 2020] [php7:warn] [pid 2702] [client 192.168.150.61:5065] PHP Warning: Cannot modify header information - headers already sent in Unknown on line 0, referer: example.com/limesurvey/index.php/questio...ideMenuTab=structure
[Wed Jul 22 15:35:18.279910 2020] [php7:notice] [pid 3057] [client 192.168.150.61:5120] PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0, referer: example.com/limesurvey/index.php/questio...ideMenuTab=structure
[Wed Jul 22 15:35:18.301910 2020] [php7:warn] [pid 3057] [client 192.168.150.61:5120] PHP Warning: Cannot modify header information - headers already sent in Unknown on line 0, referer: example.com/limesurvey/index.php/questio...ideMenuTab=structure

Please file a bug report.