Document blocked by a user

Hi:

Some days ago I posted a problem with a document library. Some users are editng a document using the 'Edit in Microsoft Office Excel' option but the document is opened as Read Only although it is not Check out by anybody and it is necessary to upload the document again.

Now I have an other problem with the same document library, if I upload tthe document and check the option 'overwrite...' I have a message telling that the document is checked out by 'username' or it is locked. But the document is not checked out.

Does anybody know what happens?

I'm using Sharepoint 2003.

Regards.

[634 byte] By [raq] at [2007-12-30]