Those links are to very old discussions which are most likely no longer relevant. The first thing to do is to ensure your Office installation is fully updated. Once you're sure of that, if the problem persists, the cause could be a faulty Office installation, a rogue third-party addin and/or a document that has acquired some form of corruption.

Accordingly, you might try starting Word in safe mode (i.e. hold down the Ctrl key while starting Word). If the process works OK in safe mode, you almost certainly have a rogue third-party addin; in which case restart Word normally, disable all third-party addins then enable each one and re-test until you find the culprit - which you should disable and replace or uninstall.

If a rogue third-party addin isn't the issue, you might try repairing the Office installation (via Word Options|Resources|Diagnose). If that doesn't resolve things, a corrupt document is the most likely cause.

Corrupt documents can often be 'repaired' by inserting a new, empty, paragraph at the very end, copying everything except that new paragraph to a new document based on the same template (headers & footers may need to be copied separately), closing the old document and saving the new one over it.

Similarly, corrupt tables (which the above process won't resolve) can often be 'repaired' by:
• converting the tables to text and back again;
• cutting & pasting them to another document that you save the document in RTF format, which you then close then re-open before copying them back to the source document; or
• saving the document in RTF format, closing the document then re-opening it and re-saving in the doc(x) format
Sometimes, corrupt tables can only be 'repaired' by converting them to text and back again.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]