reading and updating external data in FLASH AS2

Question

I wrote code (in Macromedia Flash 8) that needs to write and read data in a data.txt file located in a remote server. First it must be written new state of variables using this

    updater.sendAndLoad("http://remtoteserver.com/updater.php", updater, "POST");

the php file will write new data in json format in a data.txt. Then, it is needed to read that new data and show in the screen.

    reader.load('http://remtoteserver.com/data.txt');

and in a later frame, reader is defined by

    var reader:LoadVars = new LoadVars();
    reader.onLoad = function(success) {

    if (success) {
       trace("load successful");
       var oo:Object = JSON.parse(unescape(this.toString()));
       ncol = oo.ctot;
       numTry = Number(oo[someData].ntry);
       col[1] = Number(oo[someData].sc25)/100;
       col[2] = Number(oo[someData].sc26)/100;
       etc...
    } else {
          trace("unable to load data");
           }
    };

Well, everything is fine when I test this in flashplayer in my PC, BUT when publish the html in the same server and then test it, (1) if I update data, I realize that new data is writen in data.txt but fails to read after that, it just read the data before they were updated (old data). And if I try to update the data several times, neither updater and reader seem to work. I have to close the web page and load it again, and we are in the point (1). In brief, it seems that I have only one access to the data.txt per session (for writing or reading it), I don't know if it is a security matter from the people who manage the (free) server or what. But as I said, if I test the flash file in my PC, it's alright. Another comment, some flash methods seem not to work in Chrome, like beginFill(). Any comment or help will be appreciated.