If you are using the 32 bit version of WaveLab, try the 64 bit (or reciprocally).
or:
Copy the file:
C:\Program Files (x86)\Steinberg\WaveLab 7\Factory Presets\Plugins\plugins to ignore.txt
to
C:\Users\Philippe\AppData\Roaming\Steinberg\WaveLab 7\Preferences\Plugins to ignore.txt
Open and add in this list, the plugin name you want to ignore.
You can use wildcard characters: * and ?