Deletion of framed equation arrays

The import problem I recently reported (in the Beta forum) persists in the 6.0.14 version--namely, the disappearance of framed equation arrays. This is the type of code SWP6 doesn't seem to like:

\fbox{$% \begin{array}{l} \nabla \cdot \boldsymbol{D}(\boldsymbol{r},t)=\rho _{l}(\boldsymbol{r}% ,t)\smallskip \\ \nabla \cdot \boldsymbol{B}(\boldsymbol{r},t)=0\smallskip \\ \nabla \times \boldsymbol{E}(\boldsymbol{r},t)=-\dfrac{\partial }{\partial \,t}\boldsymbol{B}(\boldsymbol{r},t)\smallskip \\ \nabla \times \boldsymbol{H}(\boldsymbol{r},t)=\boldsymbol{J}_{l}(% \boldsymbol{r},t)\boldsymbol{+}\dfrac{\partial }{\partial t}\boldsymbol{D}(% \boldsymbol{r},t)% \end{array}%$}~ \label{cua}
%

We did have a bug report of

We did have a bug report of this type.  I've added your exact example to the bug report.