AirDrop sometimes works but mostly fails.

AirDrop under 10.7.2 usually -- but NOT always -- failed, and now under 10.7.3 it has not succeeded even once.  The message is that the Apple ID of the receiver is wrong (but it's not) or that the receiver has failed to respond (but no opportunity to respond has arisen).  How can a plug-and-play feature be such a dud?
     -- Rob

AirDrop under 10.7.2 usually -- but NOT always -- failed, and now under 10.7.3 it has not succeeded even once.  The message is that the Apple ID of the receiver is wrong (but it's not) or that the receiver has failed to respond (but no opportunity to respond has arisen).  How can a plug-and-play feature be such a dud?
     -- Rob

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    ReportDocument doc = (ReportDocument)pMainCRWReport;
    foreach (Table table in doc.Database.Tables)
           MessageBox.Show(string.Format("{0}: {1}", table.Name, table.TestConnectivity().ToString()));
    All TestConnectivity returning true!
    CrystalDecisions.CrystalReports.Engine.InternalException: Daten konnten nicht aus Datenbank abgerufen werden.
    Details:  Datenbankanbietercode: -243
    Daten konnten nicht aus Datenbank abgerufen werden.
    Fehler in der Datei CS_201001_u {870C483C-D947-4FEA-A1C6-1AD0DC4A2805}.rpt:
    Daten konnten nicht aus Datenbank abgerufen werden.
    Details:  Datenbankanbietercode: -243 ---> System.Runtime.InteropServices.COMException (0x800002D3): Daten konnten nicht aus Datenbank abgerufen werden.
    Details:  Datenbankanbietercode: -243
    Daten konnten nicht aus Datenbank abgerufen werden.
    Fehler in der Datei CS_201001_u {870C483C-D947-4FEA-A1C6-1AD0DC4A2805}.rpt:
    Daten konnten nicht aus Datenbank abgerufen werden.
    Details:  Datenbankanbietercode: -243
       bei CrystalDecisions.ReportAppServer.Controllers.ReportSourceClass.GetPage(PageRequestContext pPageRequestContext)
       bei CrystalDecisions.ReportSource.EromReportSourceBase.GetPage(PageRequestContext pageReqContext)
       --- Ende der internen Ausnahmestapelüberwachung ---
       bei CrystalDecisions.Windows.Forms.ReportDocumentBase.GetPage(Int32 pageN)
       bei CrystalDecisions.Windows.Forms.DocumentControl.ShowNthPage(Int32 PageNumber)
       bei CrystalDecisions.Windows.Forms.DocumentControl.ShowFirstPage()
       bei CrystalDecisions.Windows.Forms.PageView.ShowFirstPageEx()/
    OK  
    The error -243 is an informix error:
    Could not position within a table table-name.
    The database server cannot set the file position to a particular row within the file that represents a table. Check the accompanying ISAM error code for more information. A hardware error might have occurred, or the table or index might have been corrupted (truncated). Unless the ISAM error code or an operating-system message points to another cause, run the oncheck utility (secheck with IBM Informix SE or tbcheck with IBM Informix OnLine) to check and repair table and index.
    It seems to be that the viewer can't read the records with are locked within a transaction. I don't understand why the direct printing works. Is it possible to set the ISOLATION LEVEL for the report database connections?
    I have tried this note but it don't works.

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