Issues with solver
 

I frequently (and seemingly randomly) see the cryptic
error when running a macro using the solver add-in:

Solver: An internal error has occured, or available
memory has been exhausted.

I'm confident that memory is not the issue.
Interestingly, when I manually toggle AddIns("Solver Add-
In").installed property, I am able to make the error go
away. What's very frustrating is that when I program
this toggle, the error reappears.

Can any one shine some light on this error? Any advice
would be *much* appreciated!

Thanks,
Chris