With Flash CS4 you may have noticed some changes to the Library. Adobe has done a good job with it this iteration notably with search functionality, the ability to drag the column headers to any width and the ever so useful ability to click into the Export field and edit directly the class you are exporting.

Except the last one fails if you are adding the class initially.

To test, double click into the field to add your class. Follow that up by right clicking and selecting ‘Properties…’ and you will see that the class is not set properly.

That is … not at all. You know how long it took me to figure that one out? I dare not say.

The lesson here is to always always initially set the export class by using the ‘Properties…’ menu from right clicking the clip in the Library.