I'm honestly not sure.

Is your WoW client crashing, are you getting disconnected, or are you Alt+F4 closing the WoW client at all?

I'd recommend typing /console reloadui at random points throughout the raid to ensure your data is getting written to the hard drive.

Also, just to be sure, make sure you're closing WoW before uploading.

I'm currently having this exact same problem, we just finished running Naxx and when I went to upload the snapshots for the night there was nothing there.

At the end of the night my computer was force-restarted by Windows update and judging by Chops' reply that could have been the issue.

The only thing that is preventing me from jumping to that conclusion is that about ten mintues before my computer restarted I tried to update the dkp and once again came up with no record of any snapshots. I did do this while my WoW client was running though, could that have made it look like there were no snapshots even if they were actually there?

The last bit of info on this is for the first time tonight I tried using a different DKP auction mod then the one that comes built in with GRSS. The popups still came up every time I awarded loot and we killed a boss and I entered in the dkp charge just like I always do though so I'm not too sure if this is related in any way.

It's probably too late to salvage the snapshots for tonight but any advice on how to prevent this from happening in the future would be awsome.

Many Thanks,
Tojb

That's definitely the cause.

As you said, you tried doing it while WoW was running, which, assuming you didn't type "/console reloadui" before uploading, the data currently in the mod had no yet been written to the hard drive.

The official recommendation is to always close WoW before uploading to ensure all the data is dumped to the hard drive.

But as I recommended in my previous post, typing "/console reloadui" at random points throughout the night will help to avoid the problem of WoW or your OS crashing.