The sign-coherence conjecture for denominator vectors

Let $\mathbf{d}_{i;t}^{B^0;t_0}$ be the denominator vectors of the cluster variables at a vertex $t$ relative to the initial vertex $t_0$. A collection of vectors is sign-coherent if, in each coordinate, all vectors have either nonnegative or nonpositive entries. Sign-coherence conjecture for denominator vectors. For every $t$ and $t_0$, the vectors $\mathbf{d}_{1;t}^{B^0;t_0},\dots,\mathbf{d}_{n;t}^{B^0;t_0}$ are sign-coherent. The paper notes that this follows from the preceding denominator-vector conjecture and proves it on the bipartite belt; it remains open in general.