corruption transferred by every cell?

I want to transfer a worksheet from one workbook ("A") to another ("B").

Workbook A is used in a third-party application.

I have in Excel no problem with workbook A or B.

However after I did the copy operation, workbook A gives an "OLE" error in the thirdparty application.
Then I tried to copy one line from B to A, same problem.
Even when I copy an empty cell from B to A, same problem.

It seems that something in B is corrupt, and the sligthest thing copied out of this workbook to workbook A brings this corruption to workbook A.

I tried to save the B-file in older format, and as xlb, but this doesn't help.

I think the problem is caused someway by compatibility problem: workbook B was made in Windows8 (Office15, Excel2013), workbook A in Office14 (Excel 2010).
But, I repeat, there is no problem opening workbook B in Office15 independent from the thirdparty application, neither in Office14.
I find no issues in the references.

Anyone an idea how I could copy the (huge) sheet from B to A, without copying the invisible corruption that seems to be in the workbooK?

Thanks!

VerlindenG

Thanks for the quick reply.
I do not really believe in a problem with the third party software, because this works at many other users.
And because I always have taken care to downward compatibility, I really should'nt know which functions could cause a problem - anyway, never had a warning compilating.
Me myself, I don't work -as far as I know- with OLE-objects; (except perhapas if ActiveX buttons are OLE - but even after removing pushbuttons from my sheet, the problem persists).
So, I really have the impression it's an internal error in the workbook?

G Verlinden