>Is there a limit on how deep you can nest object calls? I have an object which calls other objects with no problems but when one of the called objects calls another object I get an error. If I move that object into the first object, it seems to work.

In addition to what Larry says, remember that for the performance sake it is necessary to reduce this nested references size.

Every dot operator within your COM object reference is actually a round-trip COM call throught the COM barriers.

If you need to call several methods from your deepest level COM it is better to assign it to a local variable (or property) Something like instead of

thisform.MyFirstCom.MySecondCom.MyThirdCom.SomeMethod1()
thisform.MyFirstCom.MySecondCom.MyThirdCom.SomeMethod2()
thisform.MyFirstCom.MySecondCom.MyThirdCom.SomeMethod3()

you should use

oCom3 = thisform.MyFirstCom.MySecondCom.MyThirdCom

oCom3.SomeMethod1()
oCom3.SomeMethod2()
oCom3.SomeMethod3()

or use

WITH thisform.MyFirstCom.MySecondCom.MyThirdCom
...

ENDWITH

The difference in the performance for such COM references in the above cases will be significantly bigger than the same in case of calling normal form objects.