If you mean the 3.4 version I already have that. In general popups work fine with that.
There's no message in the console when I try to use a Text Popup plugin command in the action sequence - it just doesn't happen. But if I disable your plugin and try it, the Text Popup works, so something is clashing between the two.
I know since VS is obfuscated it's an uphill battle doing anything. I'd even be happy with your plugin offering the ability to trigger a text popup in a plugin command or something.
If you meant something else and I misunderstood... sorry!