It seems, that there appears a new bug every hour. Try this:

Select an object, open name gallery, press "New", type in the name "Test" and hit Enter.

A new line appears with the Name "Test" and the extention "GIF".

Klick "GIF", change "GIF" to "PNG", klick Apply.

In the name gallery the extention is now gone and the little arrow for the export-options too. A white "G" appears over the red circle at the beginning of the line. It is neccessary to deselect the line and select it again to make the extention and the arrow visible and to make the "G" disappear.

Go on and klick "Rename", change "Test" in "Test1" for example and hit Enter.

The extention is now again "GIF" and not "PNG", how changed.

Klick on "GIF" - In the bitmap-export-options is still "PNG" visible - klick Apply.

In the name-gallery the extention and the arrow is already gone, like the first time. Deselect and reselect the current line again, to make the extention visible. To change the extention to "PNG" again, you have to change it first to "GIF" and then to "PNG" again.

It is not funny to let your customers pay for an update which is a beta-version and so to make your customers to beta-testers. The current Xtreme-release is far away to be a Pro!