HELP! WHEN I CONVERT TO CURVES TEXT DISAPPEARS - COREL 11

I have designed a very large document (a magazine) in Corel Draw 11 with text, drawings and photos.

I started converting the text to curves but there's a couple of text columns that disappear when I do so !

What's going on??

PLEASE help me,  I need an immediate solution to this problem!

Thank you,

Carla

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