Seeeduino Base Shield i2c Problems

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hello,

i relatively new arduino apologize if simple problem.

i have been experimenting arduino yun + seeeduino kit aws iot.  iot part not important question.  kit includes grove lcd module, works fine if plug i2c port on yun itself.  however, if plug in base shield (v2.0) , plug lcd 1 of 4 i2c ports on base shield lcd not work.

i found if have lcd plugged yun , add grove base shield, lcd stops working. 

i've been running i2c_scanner example code , works fine long base shield not used.

is there must base shield i2c ports work?  tried changing setting of voltage switch 5v, no change.

looks found answer own question.  there conflict between i2c ports , d2 & d3 on grove base shield.  had button , led plugged ports , messing things up.


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