FLStudio's plugin manager is not up to date with the latest versions of the SDK.
This was taken from the page "VST 3 Locations / Format" in the SDK documentation:
[quote]
On the Windows platform a VST 3 Plug ...
Korg microKEY 61
VSTis:
- Europa by Reason
- Native Instruments FM8
Worked good in previous version of FLStudio (December).
When i turn PB on VSTi with the mouse - it affect sound more dramatically, so it is not the visual glitch. ...