I've found that my place component tool box doesn't open when I’m placing a component.
how can I get this to pop up again when I’m placing components?
Mark,
Has it just been pushed off the edge of your screen?
Try doing a <ctrl>T in a drawing and see if turning the Toolbox off and back on brings it back to the center of your screen.
Let us know if this does it or if you still don't see it.
Larry
In addition to Larry's response.... are you using AECOsim Building Designer, and if so, which version? I just wanted to check since the subject line reads "Plant Place Component".