Go to scheduler admin panel and turn on debug-mode please.
Then try to create new event. After that find file
wp-content/plugins/event-calendar-scheduler/scheduler_log.txt
and attach it here.
Please find the log in appendix. With debug mode on however, the calendar does not even show. It seems the log has not been written either, trying to access the page.
hope you can help …
There are some problems with sending response headers when XML is requested.
Check files
yourwordpress/wp-config.php
yourwordpress/wp-content/plugins/event-calendar-scheduler/codebase/dhtmlxSchedulerConfigurator.php
They mustn’t contain any characters outside tags <?php ... ?> (especially check empty lines, please)
I have two sites running the plugin. I applied the changes you suggested. On one site it solved the problem. On The other it did not, while both the wp-config.php were changed. I even copied the plugin files from one to the other, to make sure they are the same. Also the parameters in the plugin are exactly the same, and they reside on the same server. Only difference: helium is in english, while scherma is in dutch. Strange …