Popular anime voice actress Aya Hirano reported on her Twitter account that she was prohibited by her management Spacecraft Entertainment to voice act on new anime titles since last year.
However, she said that she is thankful to still have some anime roles, since she can still continue acting on series with second seasons or extended runs. She will still continue to play the roles of Shizu in Maria Holic Alive (the second season of Maria Holic), Lucy in Fairy Tail (in the anime's second year), and Garnet in Jewelpet Sunshine (the sequel to Jewelpet and Jewelpet Tinkle).
Source: Yaraon! via Anime News Network, MyAnimeList