[SalesForce] Salesforce Wsdl not valid any more

I tried today to generate a proxy with the entreprise.wsdl file (also tried with partner.wsdl) and noticed that the file was 'not valid'.

When generating the proxy, everything seems to be okay, but at runtime (I'm writing a client in C#, but this probably doesn't play any role) an exception is raised on this line:

SForceService service = new SForceService();

The error is:

An unhandled exception of type 'System.InvalidOperationException'
occurred in System.Xml.dll Additional information: Temporäre Klasse
kann nicht generiert werden (result=1).

error CS0030: Eine Konvertierung vom Typ
'Entreprise.ListViewRecordColumn[]' in
'Entreprise.ListViewRecordColumn' ist nicht möglich.

error CS0030: Eine Konvertierung vom Typ
'Entreprise.ListViewRecordColumn[]' in
'Entreprise.ListViewRecordColumn' ist nicht möglich.

error CS0029: Eine implizite Konvertierung vom Typ
'Entreprise.ListViewRecordColumn' in
'Entreprise.ListViewRecordColumn[]' ist nicht möglich.

error CS0029: Eine implizite Konvertierung vom Typ
'Entreprise.ListViewRecordColumn' in
'Entreprise.ListViewRecordColumn[]' ist nicht möglich.

The translation in english should be something like this:

An unhandled exception of type 'System.InvalidOperationException'
occurred in System.Xml.dll. Additional information: A temporary class
cannot be generated (result=1)

error CS0030: An implicit conversion from type
"Entreprise.ListViewRecordColumn[]' to
'Entreprise.ListViewRecordColumn' is not possible.

error CS0030 : An implicit conversion from type
'Entreprise.ListViewRecordColumn[]' to
'Entreprise.ListViewRecordColumn' is not possible.

error CS0029: An implicit conversion from type
'Entreprise.ListViewRecordColumn' to
'Entreprise.ListViewRecordColumn[]' is not possible.

error CS0029: An implicit conversion from type
'Entreprise.ListViewRecordColumn' to
'Entreprise.ListViewRecordColumn[]' is not possible.

using an old wsdl file (downloaded from Salesforce last year) fixed the problem, but this is not a solution for me since I created a lot of new objects that are not in this old wsdl file…

Does anybody have the same problem? How to fix this?