We would like to suggest you the following workaround to remove blank pages: to use IImageProcessingTools::DetectEmpty and delete empty pages before adding them to the processor object or just do not add such a page. Please be aware, that this method can be not useful if the page is not completely empty and there are some garbage on it. You can find the example of using the IImageProcessingTools in the standard FCE sample "Color Stamps Removal (C#)". Just for example:
IImageProcessingTools tools = engine.CreateImageProcessingTools();
IImageFile imageFile = tools.OpenImageFile(@"Path to your pdf");
for (int i = 0; i < imageFile.PagesCount;i++ )
IImage srcImage = imageFile.OpenImagePage(i);
bool isEmpty = tools.DetectEmpty(srcImage);
Please try this and in case you need any additional help please send to SDK_Support@abbyy.com your *.fcproj project (with all used templates), input PDF files and serial number for further investigations?