It could be a theme or plugin issue
Plugins
Deactivate all but bbpress and see if this fixes. if it does, re-enable one at a time to see which is causing the error.
Themes
If plugins don’t pinpoint the problem, as a test switch to a default theme such as twentyfifteen, and see if this fixes.
Then come back
OK, Robin, thanks for your help.
Two plugins were generating the conflict:
1. Filtro de Traducción Transposh
Translation filter for WordPress, After enabling please set languages at the the options page Want to help? visit our development site at trac.transposh.org.
Versión 0.9.6 | Por Equipo Transposh
2. W3 Total Cache
The highest rated and most complete WordPress performance plugin. Dramatically improve the speed and user experience of your site. Add browser, page, object and database caching as well as minify and content delivery network (CDN) to WordPress.
Versión 0.9.5.4 | Por Frederick Townes
Now all is OK. But maybe it helps to know these two plugins to create some kind of solution.
Regards 🙏
great – thanks for coming back