Pro X3 / Pixellation problem when adding title over m2t!

[OGUL]

Hi all,
The source for m2t is HC9e.
I have no problem with Vegas Pro 9 and Adobe Premiere Elements 7!
But when I try add text with PRO X3, pixellation occurs at the beginning of the first letter for a short time like 1 second then disappears!
Then everything becomes normal!
Is there any way to prevent it?

Thanks in advance.