How come they show up for me and not others...

[ErnieTheMilk]

I'm not particularly technically minded, but I have managed to put together a vBulletin forum, done a few mods to it, and it all works reasonably well. Some mods I've done work and I've continued to use, some have not and as I am not ably proficient enough to sort out have removed them from my forum.

What I do find a bit confusing tho is that one or two of the mods I have made, I can see on my laptop and use and yet one of other users (and so I'm guessing all of them), can't

I'm specifically talking about a favicon which I uploaded which works and loads for me without issue, and yet on my mates computer its just not there, the VB logo still appears.

I've also uploaded and bastardised a quick style chooser and for me it works a treat. For him you can see it, but it doesn't work at all.

Now why would things like that be...on the whole as I say the forum appears to work without issue, I just wonder why it is things like this happen???