Nope, that doesn't seem to be the issue. There is no config file with neither whitespace nor empty line at the top. There isn't even any whitespace at the beginning of each line.
The error gets thrown at this code part in file app.js:
this.http_request = function(action, query, lock) {
var url = this.url(action, query);
var result = this.triggerEvent("request" + action, query);
if (result !== undefined) {
if (result === false) {
return false
} else {
query = result
}
}
url += "&_remote=1";
this.log("HTTP GET: " + url);
return $.ajax({type: "GET",url: url,data: {_unlock: (lock ? lock : 0)},dataType: "json",success: function(data) {
ref.http_response(data)
},error: function(o, status, err) {
rcmail.http_error(o, status, err, lock)
}})
};
If I got it right, the response coming back from the server even seems to be the login page.
Thank you so much for your support!