Problem with JPG export /// Urgent !

Hi all !

I think I'm not the first one to have this kind of problem. If someone could help me !

In X4 since today, while exporting my work as a JPG file, the export doesn't work at all when I want to create for example a 300ppp JPG file ! A size of 1x1 px is automatically shown and I just can't export high res JPG as I always do.

As a result, the JPG is never created, it only works when I am putting resolution lower and lower...

What's the problem ? How can I fix this ?

THANK YOU FOR YOUR HELP !...