Can you supply the details of your hardware and what OS version?
"IF" your hardware is up to "real world" specs (which are not Apple's minimum specs) there are two things to try.
Get "Preference Manager" free from Digial Rebellion (dot com) to quickly, properly, and safely trash Motion's' pref files.
If that doesn't help, move the Motion application from the Applications folder to the Trash, launch the App Store, Purchased tab, click "Install" for Motion.
Thanksvery much to answer my question. I am from Quebec Canada (french).
I tried your suggestion but without success.
I dont know what you mean by: hardware is up to "real world" specs? My OS version is 10.8.2
I send you the description of my hardware
Nom du modèle: Mac Pro
Identifiant du modèle: MacPro4,1
Nom du processeur: Quad-Core Intel Xeon
Vitesse du processeur: 2,66 GHz
Nombre de processeurs: 2
Nombre total de cœurs: 8
Cache de niveau 2 (par cœur): 256 Ko
Cache de niveau 3 (par processeur): 8 Mo
Mémoire: 20 Go
Vitesse d’interconnexion du processeur: 6.4 GT/s
Version de la ROM de démarrage: MP41.0081.B07
Version SMC (système): 1.39f5
Version SMC (support pour processeur): 1.39f5
Numéro de série (système): H093123A20H
Numéro de série (support pour processeur): J592901YK1LUE
UUID du matériel: 50915729-704B-56A1-97B5-0CB81AC4FCF8
I am sorry it is in french but maybe you can see the same.
If you have any other suggestion I would appreciate.
Thanks again. Richard
Happy to see you again. First I must say that last february I was in Louisiana with my wife in RV camper and we have spoken to a few cajun and they were so happy to speak french.
OK lets come back to my problem.
RAM 20 Go
Graphic card ATI Radeon HD 4870
The machine is a Mac Pro early 2009
No problem at all. FCPX 10.0.6 work perfectly well and I came back to Motion 5.0.4 that work perfectly too.
Also I have a Macbook Pro on wich I have the same Applications but on Macbook Pro, Motion 5.0.5 work perfectly.
Thanks again if you have any suggestion.