  We show spectral invariance for faithful $*$-representations for a class of
twisted convolution algebras. More precisely, if $G$ is a locally compact group
with a continuous $2$-cocycle $c$ for which the corresponding Mackey group
$G_c$ is $C^*$-unique and symmetric, then the twisted convolution algebra $L^1
(G,c)$ is spectrally invariant in $\mathbb{B}(\mathcal{H})$ for any faithful
$*$-representation of $L^1 (G,c)$ as bounded operators on a Hilbert space
$\mathcal{H}$. As an application of this result we give a proof of the
statement that if $\Delta$ is a closed cocompact subgroup of the phase space of
a locally compact abelian group $G'$, and if $g$ is some function in the
Feichtinger algebra $S_0 (G')$ that generates a Gabor frame for $L^2 (G')$ over
$\Delta$, then both the canonical dual atom and the canonical tight atom
associated to $g$ are also in $S_0 (G')$. We do this without the use of
periodization techniques from Gabor analysis.
