Topic: Simpleviewer not working in IE

I've been using SV to share photo's with family, sometimes it will work and sometimes it won't.  The family will download flash and reboot it still won't work.  They are able to view other galleries but not all.  For instance they will go to view the pictures, all will open except for the last one.  I suggested to try Firefox, clear their cache, still no luck.  what else can be done?