[Google Maps API v2] Marker not showing up anymore

Hello,

I'm new to this world and would really appreciate any help. I was
finally able to create an environment so you can see the problem.
Our application used to work and now for some reason the marker will
not show up anymore in one of the screens.
The application basically shows the marker of all vehicles in the
first screen (as soon as you log in). Until that point is fine.
However when we choose one vehicle in the grid (by clicking the
driver's name for example) the system was supposed to show the marker/
icon for that particular vehicle and, if the vehicle is moving, it
should show the points in the screen.

In IE 8 I get the following error:

Message: Invalid argument.
Line: 401
Char: 18
Code: 0
URI: http://maps.gstatic.com/intl/en_ALL/mapfiles/304d/maps2.api/main.js

Can't really figure out what is happening.
Below is the website address:

http://200.170.102.176/ezgps/monitor/monitor.aspx
To authenticate you will need:
Empresa: transp2
Usuario: googletest
Senha: google

Really, really appreciate any help.

Thanks in advance,
Giu

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