Incompatibility Excel VBA 2007/2010

[Matris]

Hi everybody!
I have a project that was created in Excel 2007. In the modules there are many constant declarations (private) with encrypted texts.
In Excel 2007 the project runs perfect.


If it opened in Excel 2010, then the error message "An error occured while loading XYZ. Do you want to continue loading the project?"
If I continue with "Yes" then missing large parts of the module "XYZ" - they are cut off, and that ALWAYS within the constant declaration area (in the head of each modul).

The same happens in the opposite direction (2010 -> 2007)

It always missing entire lines, never parts of it.

Does anyone know of this problem or someone has an idea on what to do?

It is important, because it is an commercial project...

Thanks for help and ideas!
Matris