Note: You may require, Tool->Options->Diagnostic Level = 4 in order to see these errors
I've not tried other settings because I always have mine set to 4.
If you get warning messages like the ones in the attached picture, this can fix it.
The first thing I have to say is, these errors are to do with security of your computer so if you use the following information that is YOUR choice.
1. move the dll file of any affected plugin to a folder where file privileges are granted.
I tried this on my sytem with the dll still in CamBam's Plugins folder and it would not work, I moved the file to another drive first.
2. right click the dll file and select Properites
3. on the General tab, you will see at the bottom a button called 'Unblock', click that then 'Apply', then 'OK'
The dll plugin file should now load okay.