Also make sure you use correct functions.php file. Try other themes too...

The code is correct, there is no syntax error in this code. You can check it here: You also can disable wpForo plugin before adding this code to see ...

You can find the fatal error message in file system, in error.log files. It may be on root directory or in theme directories.

This is not the fatal error message. This says nothing.

Problems come from your theme, it adds extra HTML tags in widget and around widget titles. Use this CSS code to make titles bigger: .wpforo-widget-wra...

Please provide the fatal error message. This is not 4.9 compatibility issue. Something is irregular with your PHP, some extensions are not enabled or ...

Thank you for letting us know. We'll check this.

I'm sorry but I have no clue, this code works on dozens of websites without any issue, something is irregular on your website. Try to put it in the pa...

The last two are not wpForo fields. Some plugin tries to add their fields in wpForo register form through hooks. Please deactivate all plugins, delete...

Please navigate to Dashboard > Settings > Forums > Styles admin page, put this CSS code in Custom CSS Code textarea, save, delete all caches ...

Forum URL please

Thank you for letting us know. We've fixed these phrases in next 1.4.3 version. It'll be released very soon. In any case if you need this urgently ple...

It seems you insert the code in non-php area. please leave some screenshot of your functions.php with the inserted code.

I'm sorry but this is not included in near upcoming versions. There is an alternative way to move posts described here:

Try to change it in all front-end phrases. Navigate to Dashboard > Forums > Phrases admin page, search for "topic" word and change the phrase va...