IBM_PC ISS Tracker hangs and disconnects drive mounts

[retrobrian]

Quick system description:
Dell Pentium 4 with 4GB RAM
Built in serial port (COM1)
A: is floppy drive
C: is build in hard drive
D: is mounted ISS image from irata (I've tried mounting from irata and local SD card)
E: is mounted Five Card Stud image from irata

FujiNet.sys version is 4bb4134
FujiNet firmware is 1.5.0.f71104

Problem: When I launch ISS tracker, it draws the map, places the ISS in the middle of the screen. It displays the time but it does not update. It does not post a latitude or longitude. (See Picture)

The map does not seem to update at all.

When I press Esc, it drops to a command prompt at drive D:. However, running DIR does not show me the ISS executable. Instead it shows a volume named Ac and a file called CONFIG86.COM. (See Picture)

When I try to change to drive E:, I'm told it is invalid, event though it was mounted before I ran ISS.

Let me know if you want my AUTOEXEC.BAT and CONFIG.SYS entries.