Improper shutdown of CashFootprint can cause the Options.xml to become corrupt and produce an error during loading.  This issue is being reviewed, but in the mean time the Options.xml file should be deleted.  When CashFootprint is re-opened you will be prompted to reselect your server.
The following Tools > Options settings should be reviewed after restarting CashFootprint:
- Startup size will be reset.
- Show splash
- Check for updates
- Background image
- Merchant virtual terminal settings