FM doesn't import AutoCAD DWG anymore

May be that updates, or FM11 installation can be a matter, but I can't import anymore any AutoCAD .DWG file in any version of FrameMaker. Until about 2 month ago I imported AutoCAD .DWG files, in FM10 for a client that uses a lot of .dwg files.

Now a new job, with the same client, came, but I can't import .dwg files... in any version of FM I have installed (from 7 to 11): they give me the same error:
"The filter encoutered an error and could not complete the translation."

Even the "old" .dwg I imported 2 months ago don't work anymore.

The things I do in the meantime with may PC are installing FM11 and updating vairous Adobe software I have on it.

Any idea?

(oh, yes, in the mean time I survived printing the .dwg on pdf files and importing them, but it's not the same...)