FL 11.1.0 64 bit - multithread generator processing problem

[mellif]

Hi

When I open, for example two SampleTank 3 instruments I have sound clicks.
When I turn off multithread generator processing, everything plays beautifully.
I have a powerful enough processor and now I must work on a single core or something you can do about this?

CPU:
I5-4670K overclocked to 4400Mhz
Esi Juli@
8GB ram
Windows 8.1 64bit
Fl Studio 11.1.0 64 bit

Audio options:
Asio 2.0 Esi Juli@ - 256smp (6ms)
Resampling 64 point
multithread generator processing - ON
multithread mixer processing - ON
Smart disable - ON

Whatever I change in audio settings, nothing helps. Only one option, multithread generator processing - when I turn off, I have a clean sound.
Thanks in advance for help.

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