Changing Sample Rate causing a loud noise!

PLEASE help guys! I have a bunch of templates that i use in cubase 5 (some of them took a lot of time u can imagine)… im talking about the file ==> new project ==> template.

and they are all in 44.1 hz…

BUT, if i load a template, and then change the sample rate of the project to 48hz… i get a loud whistle-like noise and im forced to close the project for it to go away…

if i open a new empty project and change to 48hz and load instruments, i dont have this problem…

could it be from my soundcard? i have a presonus audiobox 44vsl… thanks! :smiley: