Been awhile since I played but I think the No Reload option does that. Turn that option off when fishing and it's fine.
I would to be very interested in this solution, as im experiencing the same issue !
Did you remember to press F2 to open the browse window to locate your game folder? I just dloaded it and F2 brought up the Browse window for me.
If you are pressing F2 but it's not opening Browse for you, delete that trainer, dload another copy and try it.