Jess Harnell was the voice of Jerry in the first 2 seasons. They likely re-cast him with Adrian Truss as he was cheaper, being Canadian and all. Alex was re-cast as well.Blondes always seem to catch my eye the most.
On another note, I hate when Jerry's voice changed in season 3.
Winx Club is the one you're thinking about. There actually existed two different English dubs before Nick (and later DuArt) took over: the first one nicknamed the RAI English dub which is more faithful to the Italian script, and the second done by 4Kids which took more liberties. The former was only aired in a few countries such as New Zealand, Singapore, and the Philippines.There was another European import cartoon that went through a similar problem . . . I don't remember the name of it, but it was about this league of super-powered fairies, and at one point it employeed Canadian voice actors for the English dub, because half of the fairies were voiced by ARTHUR voice actors - specifically, the actors who voiced Marina, Francine, and Fern. Then, at some point, I think Nickelodeon took over the import of the show and completely recast the voice actors since it was no longer being dubbed in Canada.