I have been a postdoc for several weeks in this position, and participating in a collaborative project. My mentor is encouraging, but his collaborator does not seem to like me. I tried to make the collaborator interested in my work and propose my ideas, but he just turned down my idea coldly each time. When my mentor and his collabotor had disagreement, I tried to follow my mentor. But the collaborator insisted that I follow his orders and force me to agree with him by freaking out and warning me. He warned me that every paper we publish should have his approval. I found that this seems to be true, as he did most of the analysis and my mentor is from an area not very relevant to this subject.
I am afraid this may not be the postdoc training I am pursuing. If I seek for new postdoc positions, how could I explain that I left my current lab after only several weeks?
Thank you!