Problems with Version: 4.2.1.1 PDF export

Just tried to export a doc. as a PDF. The resultant PDF came through corrupted. When I went back to the original file, that was also. Is there any way I can recover my old doc.?

If the original file was saved to the old binary DOC format, you have likely lost your data. A third-party DOC-recovery tool may be able to recover some of the data, but using these tools can never really be recommended. Always save to ODT and export to non-ODF formats as required.