I've tried "replace" and while my project is building it adds another build to the queue.
EDIT: I have no idea what this trigger is doing. I set it to run at 18:05 and it started at 17:53:23. Why is it starting BEFORE the trigger time?
I set the polling interval on the trigger in question to 300,000 because it take my project about 5 minutes to build. I don't know if that is contributing to the problem.
The bug discussed in this thread relates to FinalBuilder Server. The fix was included in build 230, and the current release build is build 262 which does include the fix.