When I paste in an item containing text from one .iso file to another, it seems to randomly change the font of some of those items to Arial. (I'm not talking about pasting straight text directly into another line of text with the text tool - but pasting completed lines of text into the file as individual items, or as part of other grouped items). This does not happen consistently - some lines of text (within a collection of items being pasted) change fonts, others stay as they were supposed to. How do I prevent this from happening?