UAD-1 playback/render problem [Reaper 2.011]

[boka]

Hi!
I'm having serious problems with my UAD vs Reaper. My problem I havent been able to solve is to create flawless renders. First of all my config/settings.

my PC config: Intel Core2duo E6300, Asus P5b, Kingmax DDR2-800 2*1GB, E-mu 1820m
my [starting] Reaper settings which may be in connection with my problem. / reaper 2.011 /

FX processing settings are unchecked.


FX processing settings are unchecked.
UAD-1 synchronous mode off


my UAD settings (latest (4.8) software)


Okay, to represent my problem let's say i want to get a slightly overdriven sounding kick with disco character. Sample hunting ended,bpm is set to let's say 125, 4p4 pattern created.
I select Cambridge eq to boost a little bit. Good stuff, I love the Cambridge! With the feature presented above loop-playback is good, no problem. But, If i make a render (force 1x render is checked) the first sample will not be rendered perfectly.



If I selected UAD-1 synchronous mode in the preferences even the playback would sound the same like this render.