Created attachment 113929 [details]
ODT file with simple table and merged cells

Environment: 
LibreOffice 4.4.0.3, also reproducible in LO 4.2.8.2 and 4.3.5.2.
OS: Windows 7 Professional 64-bit Spanish + SP1

Steps to reproduce:
- Create a blank document in LO Writer.
- Create a 4x4 table.
- Merge these cells: (row 3, col 4) and (row 4, col 4).
- Try to select the entire table with mouse.

In my case, the first 3 cells on the last row can not be selected.

The table can be entirely selected with Table > Select > Table, with the diagonal arrow on the upper left corner of the table, or pressing Ctrl-A twice when cursor is inside the table.

Example ODT document attached.