The URL parser is somehow more strict than before and does not like the "|" character (to fix some security issues)
You could use this instead:
http://www.plantuml.com/plantuml/uml/9Suz2y8m4CRnFP_YAEeaRNo7qjI284wkuXZICmdafIHNyEERulRZXlyzGoQPQFQE9LGaWtO8rTscJ1LqtUg9rFSiH49m-246xpY3aW7cZ62zr9XPPxrk3T6KswPHfkHg7MC9oSdcMaN_FrwL8J4TDigCWjeptnvvSHRx4__k-68d7kXSN5zkhvZSs3CC8oo_sL1KDlu0
If it's a big issue for you, we might automatically change | to %7C, however this is something we would like to avoid.
Hope this helps!