I sent an email with two bugs of hexedit 4.0 over a year ago as the registration to hexedit.com forum was broken. I am not sure if the bugs are still present. I have not been working with hexedit since then and need some time to get into it again. Nevertheless here are bugs I found back then:
using %b in the display field of a integer data immediately crashes
hexedit. I was looking to a way to display binary data as bits and
simply tried out if %b does that... %b is not documented and will
probaby do nothing but it should not crash.
1-byte bitfields only work with up to seven bits but not with 8.