Does the old project use TTS-1 synth ?
If so, then try removing tracks with TTS-1. Actually if the track is not an Instrument track, you can simply mute the MIDI track driving the TTS-1.
Some of my old projects with TTS-1 tracks crash as soon as the first note is sent to TTS-1. Some old projects with TTS-1 work fine.
New Platinum projects have no issues with TTS-1.
I am still working on figuring out what is going on. This has been occuring since July release I think.