XD Pro 7: Error during saving:" - Bug?

[Yellosub]

Hi all,

today I've experienced a strange behaviour of XDP 7:

created a rectangle, applied a drop shadow, duplicated it and then made a blend with these to copies.
Then converted the blend into editable shapes. Trying to save the file after that results in an error message.
The file cannot be changed. What's even worse, if the file existed before, it's being deleted from the hd.

Has anybody else had this problem?

Regards,
Hubert