MIDI channel dissapeared, not able to add MIDI channel again

[olibc]

Hi,

Suddenly the MIDI channel dissapeared from Audio Gear configuration.
I try to add a MIDI channel and select MIDI interface and VST.
But when I select any other instrument but "Electric guitar" it resets the selections I made (including Instrument).
If I only select MIDI interface and VST (without selecting Instrument) and click OK, window closes but no MIDI channel is added.

Is this a limitation of free suscription?

Any suggestions?

Thanks