This applies to Geant4 release 6.0 and probably all platforms and OSes.

In G4eIonisationParameters.cc the following code limits the file length of the
G4LEDATA (ionisation part) to 100 characters:

l. 188 ff:

    char nameChar[100] = {""};
    std::ostrstream ost(nameChar, 100, std::ios::out);
    ost << pathString << Z << ".dat";
    G4String name(nameChar);

I have no idea why the ostrstream has been initialized with a char array.
If this is important one should increase the character size to at least 1000:

    char nameChar[1000] = {""};
    std::ostrstream ost(nameChar, 1000, std::ios::out);

If there has been no good reason to initialize the ostrstream with an array, a
nicer alternative would be:

    std::ostrstream ost;
    ost << pathString << Z << ".dat";
    G4String name(nameChar);

I have tested both version successfully on debian linux.

Let me know, when the problem is fixed.

Andreas Zoglauer