Mpc Ren 1.3.1 problem with Native instruments plugins

Hello,
I recently bought my renaissance and i have a midi keyboard hooked up to the mpc usb port.
When i load a native instuments plugin in the mpc softwear and i press a note on the midi keyboard it plays constantly and won't stop.
With all the other plugins this doesn't happen.
Any idea how to fix that?
Thanks in advance.

which ni synth ? well massive works ,monark, works razor so which synth do you mean...?

Massive and absynth5 are the ones i tried!
I use them as au plugins cause i use a macbook

It seems like a bug ans maybe the will fix it with 1.4

i m on win 7 the only ni plug which give me problems is guitar rig 5 but guitar rig 4works...

You need to use plugins as vst not au that will solve the problem.had the same thing.you can import as vst in preferences,just rescan and everything should work.

So it is a bug...
Thanks a lot! i will try it as soon as i get home