It doesn't 'stop' at 48. That is as many entires as it can display at that screen resolution. To access something further down the list, with the focus on the list, type in a start value - say 5 and it'll jump down to say 50, now use the up/down arrow keys to scroll through the list... This is a common issue with the 'inputbox'. The only way to get a scrollable list is to use a webdialog of your own devising...