Display problem with Notepad's Image Gallery

Hello!

First I'd like to thank you for this nice piece of code. Studying it was really interesting for the beginner I am.

But I've found a problem: The code works perfectly on my local server (EasyPHP) but some images do not show when uploaded to my provider's site. No errors provided: the 'alt' text appears instead of the image. I've not been able to found a pattern for this: size, format (GIF or JPEG), transparency or not, file name... Simply some images doesn't appear, neither as a thumbnail nor as a full image. And they're always the same ones. I've been playing with cache headers and usleep() in the middle of the draw_image function, but nothing to do...

Have you a clue about this?

Thanks in advance,
Juan

Update: Adding this header in the draw_image function makes that even in the local server some random images disappear. Reloading the page changes the images being affected... usleep() doesn't help.

header('Content-Length: '.filesize($src));

Well, I'm sorry, I should have debugged it better before adding all this updates.

I think I've found where the problem is, but I can't find a solution. I'm lost...

I've been experimenting with imgsrc.php and I've found that the 'src' parameter is the problem. I have two files, the same image in GIF format doesn't show in the remote server, if I convert it to JPEG it shows. Well. If I output all this:

echo $src;

$imgstring = file_get_contents($src);
echo $imgstring;

$img = imagecreatefromstring(file_get_contents($src));

I get the expected garbage for the JPG file but nothing for the GIF (always in the remote server).

Conclusion: the 'src' parameter doesn't get this:
/Partners/partners-ALSIA.gif
but get this:
/Partners/partners-ALSIA.jpg

I verified it with
echo echo $_REQUEST['src'];

But other GIF files pass through. It depends on the file. Incredible. The problem is in the remote server, but... where?

Really puzzled,
Juan