Problem with inheritance and object share use?

[tonnot]

This is the skeleton of my app.

- ClassA       has a    ClassE    * myclassE_inside_A    public var.
    - ClassB    Inherits ClassD 
    - ClassC    Inherits ClassD  
 
- ClassD has some funtions and  *ClassE public var.

- ClassA       has a    ClassE    * myclassE_inside_A    public var.
    - ClassB    Inherits ClassD 
    - ClassC    Inherits ClassD  

- ClassD has some funtions and  *ClassE public var.

To copy to clipboard, switch view to plain text mode 

The idea was to deal with classE instance from class A, B and C. And use some common methods of ClassD from ClassB and ClassC.

Pseudocode that describes its operation.

Inside ClassA:
    ClassB my_classB;    
    my_classB.create;   (I have the *ClassE filled with data )
    myclassE_inside_A = my_classB.classE;
 
    ClassC my_classC;
    ClassC.set_classE(my_classE_insideA); 
    for(   ) 
    {  do some things with my_classE_inside_A ;
        classC.modify_some_things_on_classE }    
 
    -  classC.modify_some_things_on_classE uses own methods and one function  inheritated from classD.

Inside ClassA:
    ClassB my_classB;    
    my_classB.create;   (I have the *ClassE filled with data )
    myclassE_inside_A = my_classB.classE;

    ClassC my_classC;
    ClassC.set_classE(my_classE_insideA); 
    for(   ) 
    {  do some things with my_classE_inside_A ;
        classC.modify_some_things_on_classE }    

    -  classC.modify_some_things_on_classE uses own methods and one function  inheritated from classD.

To copy to clipboard, switch view to plain text mode 

When I run the program I have a lot a heap error and a lot of crahes
HEAP: Free Heap block c977e28 modified at c977e5c after it was freed
(Internal error: pc 0x2ff in read in psymtab, but not in symtab.)
(Internal error: pc 0x2ff in read in psymtab, but not in symtab.)
(Internal error: pc 0x2ff in read in psymtab, but not in symtab.)
,,,,

The error was related with classC, after the first modification of classE object. the second time I use it (it is the same if I do it from myclassE_insideA or int classC) i have the crash.
I'm sure that I' forget to do something but I dont view it.

It is as If I can't use the classE object by pointer. ?

Any idea ?