Unable to load requested class: paypal_lib

[eluser]jiggs[/eluser]
a few things i have tried:

1. remove the .htaccess file, no good so i restored it
2. copied the Paypal_Lib.php to applications/library and system/libraries, one at a time - no good.
2. all my other classes are working within applications/library folder so i decided to move the Paypal_Lib.php back there.
3. on my config file there was a subclass prefix setting initially to be = 'MY_'; i tried toggling between this and a blank value - no good. so decided to move it back to MY_
4. the instant i deleted the call to the library from my controller everything seemed back to normal.

Im confused already please help!!!