Graepat 2, from the symptoms you note, I believe it is another common problem of PD18. If you are comfortable with regedit, you might try this support option to correct.
1) close PD
2) open regedit and browse for the registry key Computer\HKEY_CURRENT_USER\Software\CyberLink\DSP_EffectLogger
3) right click on “DSP_EffectLogger” and export so you have a recovery option if need be
4) after successful key backup, rick click again on “DSP_EffectLogger” and choose “Delete” in the right click menu
5 ) exit regedit
Launch PD18 and see if those two issues are resolved, "Fix / Enhance" crash and "Keyframe" crash.
Jeff