MIDI Guitar 2 will not stay open on iPad Pro 2017

[pilotshort]

I have been using Midi Guitar 2 on my iPad Pro 2017 model without a problem. Suddenly when I start it now , it minimizes. When I try to maximize it again, it only stay open for a few seconds before it minimizes again.

Any help would be appreciated.

[JamO]

This is a new kind of issue to me.
I’d try to restart the iPad or if that doesn’t work, please consider updating to MG3 Beta:

MIDI Guitar 3 beta for iOS is now available!

MG3 betas are now also available for iOS! MG3 was made from the beginning with iOS and touch screens in mind, and I’m excited that iOS and desktop versions can now follow along, with very little development overhead. Almost identical to the Mac version! Runs both as a host for plugins and as a plugin inside hosts. Free for now! (this was supposed to dump into your chimney, two weeks ago) Limitations: Newer iPad (circa 2021) required for now. Older devices may be su…

[pilotshort]

So I uninstalled Midi Guitar 2, then reinstalled it. Problem fixed mostly, but it wants me to pay for the 3rd party plugin ext again. Apparently the lic was tied to my orig installation.
How can I fix this?