Just installing Chat makes my admin screen go white

I know it's in beta, so I'm not expecting any magic, but just installing Chat makes my admin screen go completely blank.

I upload it via FTP. I can see it in my Plugin list. When I click Activate...

White screen.

I can click back and see my plugin list again. But when I Delete ...

White screen.

I deleted it through my host...and I got my admin screen back.

I thought maybe it...I don't know, downloaded funny. So I deleted it from my computer and redownloaded it...and tried again.

Same problem.

Does anyone know why I'm getting this problem?