I have studied karate for years, and am now taking up Aikido about 5 months ago.
Initially people had to really stress the concept of blending
as I've been trained to parry and destroy with my blocks.
So as a result,my karate is becoming a lot softer, and that's by choice.
Also I never realized how much energy was head on energy in karate. I always felt I was redirecting my oponent. Boy have I learned differently.
The good news is because of karate I can take a hit and dish one out as well, but with enough Aikido I can hopefull avoid getting hit at all.
So.. right now no problems x training.. though the traditionalists in Karate may not like what I am becoming