When saving a document in Impress, text which has been deleted from a table
reappears after presentation is loaded again. To reproduce the error do the
following steps:

1) Create a new presentation
2) Insert a small table e.g. 3 rows x 3 columns  
3) fill entries in the table with random text (see step1.pdf)
4) Save the document (IMPORTANT, the bug will only appear if the document is saved
5) completely delete the text in one cell of the table (see step2.pdf)
6) save the presentation and quit impress
7) Reopen the presentation again, the deleted text is there again (see step3.pdf)