Hello, thanks for the feedback! The issue pictured above is happening due to templates that are not finished yet. Those templates should be marked by question mark in the corresponding thumbnail. Just a couple days more and it should be fixed.
As for the export problems, we'll have to check it out. If it's not a problem, can you provide more details if there's any pattern for the first issue (for example, it only happens when exporting in batch, or when option X is selected) or it's totally random?
As always, thanks for your feedback and support!