Unexpected switchboard shutdown

I have designed and secured a database in Access for a client. I did the
design on my Dell computer. I burnt the program, workgroup etc to a CD and
put the program on the client's computer. The computer is part of a network
but for the moment the .mdb and .mdw and are in a special folder in the
user's My Documents.

On my computer I can go from switchboard to switchboard by clicking on the
switchboard items. When I close a switchboard by clicking on the small X in
the upper right hand corner, I see the previous switchboard. On my client's
computer, however, if I go from the Main Switchboard to another switchboard
and then click on the X to go back to the previous switchboard, the
switchboard closes down and I must open the database again.

Has anyone else experienced this problem? Is there any way to identify what
is happening and prevent it - some code perhaps?

Thank you for any insight provided.

Mary