SharePoint Datasheet view in Read-only mode ? Try these Solutions

Issue: In Datasheet sheet view, users unable to edit anything. Its in always Read-Only mode.

Solution:
Check the following to fix SharePoint list in datasheet view is read only:

1. Content Approval must be turned OFF 

Microsoft KB: http://support.microsoft.com/kb/2274841

     2.  Some of the columns are dependent on the Microsoft Access, Check whether MS-Access is installed in client machine.
     3.  Check whether you have permission to edit
     4.  The document in the current row may be checked out by a user.
     5. Attachments are read-only in a list that requires content approval. You cannot view or edit attachments in any of the views.
     6.  Certain columns, such as Created By and Modified, are always read-only.
     7.  There may be an unresolved conflict or error in the selected row or column. Resolve the conflict or error before attempting to edit the selected row or column.

Update: To use edit in Datasheet view, even with content approval turned ON, use my trick Edit in Datasheet View - Even When Content Approval is Turned ON