I have had this problem before with my computer and Hal! It happens on rare occasions for me And I don't know what causes it.
Also it does not seem to affect the Brain databases (.db) Files So you shouldn't lose any Information You've been teaching.
"The fix": The only way I've been able to fix this happens is to Backup your brain database If you wish And uninstall Ultra-Hal. Then restart your computer, afterwards download a new Ultra Hal Assistant 6.2 On the website,
https://www.zabaware.com/products/store/comersus_viewItem.asp?idProduct=1. After installing Ultra Hal Assistant 6.2 If it asked to restart your computer do so.
In short, a clean install With a new Hal Setup.exe.
Hope this helps!!!