hidden rows below frozen rows

I have a worksheet where I have frozen rows 1,2 & 3 and have 244 rows below those three but for some reason, all of a sudden I can arrow down below row 244 as far as I want but cannot arrow up through rows above row 244. I did not intentionally do anything that would cause this to happen and can therefore give no history leading up to this problem for diagnosis assistance. I have looked in the help area under frozen rows and hidden rows but cannot come up with any other topics to search, hopefully someone knows just what is going on and can shed some light on this for me.
Thanks for any help you can give!