How can you set the vertical alignment of table cells in LyX? The right-click menu shows three choices ("Top", "Middle", "Bottom") but none of them is enabled, they are all greyed out.
Vertical alignment of cells in LyX is TeXnically based on the
b column types offered by the array package. However, for these types you also have to specify a width.
In LyX, just open the "Table Settings" window. After you have specified a width, the "Vertical alignment in row" combo box becomes enabled.