This is a compatibility issue between locale/font settings and Java's latest update. Until an update to ad hoc is released, use the following workaround:
- Go to Tools > Settings
- Click the Font and Locale tab
- Change the font and locale to <default>.
- Restart Ad Hoc Analysis.
A huge thank you to Kush Soni for the workaround. If it does not work for you, please reply to this thread.