  We revisit the vacuum structure of the $\mathcal{N}=1$
Intriligator-Seiberg-Shenker model on $\mathbb{R}^3\times S^1$. Guided by the
Cardy-like asymptotics of its Romelsberger index, and building on earlier
semi-classical results by Poppitz and \"{U}nsal, we argue that previously
overlooked non-perturbative effects generate a Higgs-type potential on the
classical Coulomb branch of the low-energy effective 3d $\mathcal{N}=2$ theory.
In particular, on part of the Coulomb branch we encounter the first instance of
a dynamically-generated quintic monopole superpotential.
