Hello,
1. StockSubmitter does fully support vectors.
You don't have to create ZIP files manually anymore. Just put the EPS file in the same folder as JPEG preview with the same name. It will be automatically "attached" to the JPEG file and automatically uploaded/submitted to agencies. ZIP files and previews of custom sizes (for VectorStock, for example) will be prepared automatically by the program during upload.
2. This is the common problem and it is caused by Windows hiding network drivers mapped from the non-privileged user from the applications started as administrator.
There are few workarounds for that:
a) Run this .reg file and reboot:
http://www.winhelponline.com/blog/wp-content/uploads/enablelinkedconnections.zipb) Mount network folder into some local folder using the following command in console:
mklink /h C:\[Local Folder] \\[Full Path To Network Folder]
c) Launch console as administrator and execute the following command:
net use h: \\[Server Name]\[Share Name] /user:[Logon Server]\[User Name] [Password] /persistent:yes