No waveform/ sound when exporting sequence

Hey...This is the 2nd problem I'm running into and wondered if anybody else had this issue....I'm on a brand new mac mini running Catalina. I'm using Studio One 5. When I export a sequence as a audio mixdown, I select explode and then I select the WAV format. I create a new folder then select my SD card to save to. The MPC X shows all the tracks exporting. I open up Studio One and go to song>import file, then I pull up the sequence. The files open up empty with no waveform. BTW , I went into the preferences export/audio section and made sure everything was right. I even tried ALL of the options....export as track, program, master....nothing worked. Anybody ?

I've seen some of this behavior before, especially with audio tracks. What kind of tracks are you trying to export?

Just the midi tracks with samples