To have us assist you further, could you please review this topic and let us know the results from following the troubleshooting steps? Also, can you provide the details of your system?
http://www.prepar3d.com/forum/viewtopic ... 2&t=123246
If the issue is determined to be caused by an add-on, you will likely want to reach out to the add-on developer for direct support. If they need any support with development, they should not hesitate to contact us.