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If you want your replies via e-mail, use the pertinent subscription options the forum software provides. That's all there is to it. Anyway, you do not provide any information or screenshots, so this is slightly pointless and we are left with just guessing. Since OF is dependent on OpenGL, these could be artifacts due to an insufficient graphics card config. On the other hand it could just be their protection if the license is invalid.
Without seeing an example, it sounds like the kind of protection they use if the plugin isn't licensed properly. Follow the directions you get when you purchase the plugin from them on how to license it.