David,
in addition to Jeff's answer there's one thing to be aware of: if there are different releases of the same product installed on one machine, look at SA specific path entries and environment variables. They may influence what happens, when you start programs from the command line.
EBF installations should run as expected if the Symantec SA version is installed as part of the AV product, not as a regular installation package like SA Studio.
Regards
Reimer