Mixed Mode VB calls F90, Access Violation

I have a program that runs fine as an executable.  I made a DLL out of it and called it from VB.  That all works fine until it comes to the part of the F90 code where there's an array of Types.  As soon as it references a member of the type MB(I)%Time, it throws an access violation.  I tried declaring the array of Types as both Static and Dynamic, it still ACCVIO's out.  I wonder if this is something in the security model?