You can either acquire zen (first tab) or sell zen (second tab). Try the second tab; if it still saying that you have 0, check your inventory (assets tab). If there's an inconsistency; make a ticket.
That's quite the paradox, how could you nerf nerf when the nerf is nerfed. But how would the nerf be nerfed when the nerf is nerfed? This allows the nerf not to be nerfed since the nerf is nerfed? But if the nerf isn't nerfed, it could still nerf nerfs. But as soon as the nerf is nerfed, the nerf power is lost. So paradoxally it the nerf nerf lost its nerf, while it's still nerfed, which cannot be because the nerf was unable to nerf.
If you mean to transfer zen between games, then only purchased zen which hasnt been assigned to a game can be transferred. The zen from sub's etc are considered 'promotional points' and are locked to that particular title.
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I call it, the Stoutes paradox.
Still waiting to be able to use forum titles