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 ...
Title states it pretty well, all my vst's no longer work with note pan or velocity anymore...works fine in fl 10
Reflex can you shed some light on this. ...
FLStudio 10.
I installed Wavesfactory Trackspacer2 (on Windows7 64bit).
I Installed VST2.4 (32bit) and VST3 (32bit and 64bit) of that plugin.
I opened FLStudio 10, and after I scanned for new plugins(a few times) only the VST2.4 ...