I have seen this myself today. Two users, open Filemaker, then navigate to an often used layout...all the otherwise Arial fonts are replaced with some strange font. If you select a field that can be edited, and choose the Format>Font from the main menu, a font is listed among the huge list of fonts, and is checked... "Z@R4DB8.tmp"
I'm attaching a screen shot of what it looks like...
This is a hosted file, (FM14 Server, and FMP14 client). Any idea how something like this can occur?
We did a re-boot on the client, and now it looks fine. But it so strange that it happened at all. These are Windows 7 64 bit machines.