Quick internet search shows numerous accounts of Visnovsky having some sort of no-trade clause in his contract.
Why it didn't come up for a month after he was dealt? That's an interesting question. With potential lockout ahead, could he be just using this clause to get a signing bonus on future deal? (Under CBA you can't just convert salary to signing bonus for an existing year.)
Visnovsky's agent is Neil Sheehy, a Harvard grad. I can't imagine that he would have forgotten that his client had this language in his contract.
Forever1940 is the nom de plume of Eric Hornick, statistician on Islander home telecasts since January 21, 1982. Visit my blog: NYISkinny.com and follow me on Twitter @ehornick