Nice to see you still interested and working at it.

After testing, it looks like the the command post priority is confusing the allied engineer. At a guess the engineer is looking for the command post and with no node connections it some how gets confused. Why i don't know. Tried improving the paths to the bridge, adding roams even a route-altroam but the only 2 things that worked were
Quote:
// AI script for Transmitter
// Created by: frank
// Last modified: 9/01/06
bot_SightDist 3000 //how far the highest skill bot can see on this map
spawnflag_is_priority 1 //should bots focus on spawnflags?
cmdpost_is_priority 0 //are cmdposts critical on this map?
construct_is_priority 1 //should engs focus more on constructibles
map_has_vehicle 0 //does this map have a tank or a train?
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--- OR ---
changing the goal for the allies building the command post to 1
Myself I would recommend the second option.
BTW proper goalnum sequencing should help with your barrier vs command post problem.