Diablo III patch introduces experience glitch, easy work around found
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Users have reported a new glitch introduced with Diablo III's patch 1.0.3, but an easy solution is available.
According to many complaints on the Diablo III forums, after the patch some players may find themselves unable to earn experience.
Happily, it looks like you ran remedy the issue just by changing your password.
Patch 1.0.3 began rolling out overnight and will be accompanied by several periods of downtime spread across all regions.