No i did not check it.
But your answer triggered me to see this option in weaver theme: Disable Page/Post Font Family/Size Selection – Checking this box will disable the Weaver Xtreme Plus Font Family and Size options in the Page/Post editor. This option does not apply to the base Weaver Xtreme theme. ♦
i did disable it and the problem solved!!.
the weaver theme provide font control but your plugin still more easy and robust and never failed me.
Thanks again for support