This is strange, because I use 1.9.0 and it's still working fine. Did you by any chance added another plugin to the plugin list? There might be a plugin conflict.
No, I playing your demo (v130) and add nothing to the demo.
Are you using RPG Maker 1.9.0 (version, not corescript version)? Like the software version.
My bad I thought that was the same thing, I downloaded RPG Maker from the site and reinstall it, now it's ver 1.9.0 and the problem fix.
No, I playing your demo (v130) and add nothing to the demo.