sijad I get the same error. Using beta 7. Steam button is also not displaying properly.
Deprecated: Zend\Stratigility\Http\Request is now deprecated. Please register Zend\Stratigility\Middleware\OriginalMessages as your outermost middleware, and pull the original request via the request "originalRequest" attribute. Zend\Stratigility\Http\Request::getOriginalRequest will no longer be available starting in Stratigility 2.0.0. Please see https://docs.zendframework.com/zend-stratigility/migration/to-v2/#original-request-response-and-uri for full details. in /home/removed/public_html/forums/vendor/zendframework/zend-stratigility/src/Http/Request.php on line 100
Fatal error: Uncaught exception 'RuntimeException' with message 'Unable to emit response; headers already sent' in /home/removed/public_html/forums/vendor/zendframework/zend-diactoros/src/Response/SapiEmitterTrait.php:27 Stack trace: #0 /home/removed/public_html/forums/vendor/zendframework/zend-diactoros/src/Response/SapiEmitter.php(27): Zend\Diactoros\Response\SapiEmitter->assertNoPreviousOutput() #1 /home/removed/public_html/forums/vendor/zendframework/zend-diactoros/src/Server.php(162): Zend\Diactoros\Response\SapiEmitter->emit(Object(Zend\Diactoros\Response\RedirectResponse)) #2 /home/removed/public_html/forums/vendor/flarum/core/src/Http/AbstractServer.php(36): Zend\Diactoros\Server->listen(Object(Zend\Stratigility\NoopFinalHandler)) #3 /home/removed/public_html/forums/index.php(16): Flarum\Http\AbstractServer->listen() #4 {main} thrown in /home/removed/public_html/forums/vendor/zendframework/zend-diactoros/src/Response/SapiEmitterTrait.php on line 27