Created attachment 688735 [details]
Good ODT file.

Description of problem:
When editing a docx formated file, inserting a hyperlink with a pound sign (#) causes everything after the hyperlink to vanish after saving, closing, and reopening the file. 

Version-Release number of selected component (if applicable):
3.5.7.2

How reproducible:
Always

Steps to Reproduce:
1.Create or save a file in docx format.
2.Insert a hyperlink with a pound sign into the document. For example, simply copy and paste the following link into a document: http://windows.microsoft.com/en-US/windows/service-packs-download#sptabs=win8
3.Enter more text after the hyperlink.
4.Save the document.
5.Close the document.
6.Open the document.
  
Actual results:
Any text entered after the hyperlink is not saved even though LOWriter seems to be saving everything. In addition, the hyperlink is either truncated by one character or entirely deleted. Each subsequent save will truncate the link one additional character. Any text before the hyperlink is retained.

Expected results:
Everything in the document should be saved.

Additional info: Seems not to be an issue when using the odt format. Try saving the attached odt file as docx to see the issue in action. Remember to close it and reopen it to see the effect.