More information needed.
What firmware are you running?
What version of beat2x are you using?
Which pack are you trying to use?
Where exactly does it hang. You say when you press 'start' but what does the screen look like before you press 'start'? (you can press start at many different points)
Can you list the relevant contents of the SD card? that is, where is the app installed and what exactly is the contents and name of the "packs folder"?
Also, you probably did not get an answer because nobody recognized the problem as something they have seen before; perhaps the author of the program might answer you but he may not read the forum every day.
Insulting the community isn't very nice either.