We've been having this problem with Aspose.Slides after deploying an ASP.Net solution on a customers server. The evalution text appears sometimes. It's usually like this, the first time you create a ppt the text appears, the second, third and so on its fine. If you then wait a while and try again, the evaluation text comes back 1 time and then disappears.
The SetLicense call is done in the beginning and the license file is in the right place. What can be done to prevent this text from appearing ?