[Samba] "Incorrect function"?

[j2]

I upgrade from 2.2.3 -> 2.2.7a using the debian packages.  Now, i have a big
problem.

Mapping drive: Ok
Accessing the drive: Ok
Trying to access a folder a popup emerges saying saying

silo-1 on 'cookiemonster' (S:)
S:\data is not accessible.
Incorrect function.

OK


i see no errors in the logs, and am really stumped... reading a _file_ in
the share works as expected tho.

Creating a new folder yields

silo-1 on 'cookiemonster' (S:)
Unable to create the folder 'New Folder'
The System cannot find the file specified

OK

Creating a new file works

Trying to _delete_ a file yeilds

Error deleting File or Folder
Cannot delete "New WordPad document: Invalid MS-DOS function.


Help... Please :)