If you have the Page Palette showing, you will see there are two pages showing (View > Palettes > show Page palette).
Signlab will now try to create multipage PDF's, one for each page that you have showing here. The -1 comes from Page 1, -2 from page 2 , etc. The additional pages seem to come with Copy/paste actions.
You can click the button[...] to the left of the pages palette and collapse all pages, then you will see only Page 0.
Publishing to pdf when it is like this will work as before.
You can add the following to your CADlink.ini to try and minimise when this happens.
But you do not want to do this if you think you will use multiple pages on purpose.