URLLoader not working in good way when swf in server

I use some URL loaders in my swf to get lines from txt file in server. BUT when I do tests on my compiuter it works fine, I had some isues before but now it works good. But when i upload swf in html in web browser I have some problems. FOR EXAMPLE: In TXT file i have lines for example: Hello Bye Hey Swf shows lines: Hello Bye Hey BUT if i change lines in TXT for example: Hello friend Bye my love Hey, how are you Swf shows lines: Hello Bye Hey WHY I SEE OLD LINES FROM TXT FILE> in every case I have new call to this URL loader but see old lines. Why this hapening? I use for these test string var textline = []; maby here is the problem? Sometimes swf uploading new (right) lines from txt files, when I try this other day 😄 Or after some time. Maby some ideas why this happening? All permisions for files in server is 777.