Database design question

[John Clark]

So many questions from a newbie... sorry chaps.

I am designing an image viewing database in filemaker and will eventually port this to filemaker server. The clients will only have access to their pictures when they login. They will be able to choose and order photos on line. I have designed a the database so that when the client logs in a $$sessionID is generated which keeps the clients info separate from others. I am testing on a web server in Filemaker 9 and it crashes when 2 users are on. On my local network (9 advanced) it works fine.

What I would like to know from you experienced guys out there is that am I barking up the right tree in the way I am designing the database or is there something blinding obviously wrong which may cause problems later.

Regards