Is that the free version? I'm using version 4.4.29 from
this thread, though an higher version has been shared since I last updated. Updating solved a problem I had in a VX Ace game (though it may just have been that I was bad).
I just ran a test and everything worked fine for me with this game, so it likely isn't a problem with the game itself. Did you try exporting as a zipped game patch?
Also, pay attention to where the file is getting exported to. T++
usually wants to save files to the last place it saved/exported a file to, but my copy also randomly decides to instead try to save to my T++ folder.
Is this your first project? I can write up a quick guide if you think it'll help. I'm not an advanced user, but initializing a project is usually the least troublesome step.