ProTools does Not use VST plugins. Are you trying to open VST plugs in PT? Are you routing the midi into logic, and then the audio from that in to PT? I would suggest you try recording the midi in to Logic, and create audio files of the session, and import the files to PT region's and drag to a PT session, with RTAS plugs for editing... This way you only have 1 DAW software open at a time... My $.002...