Bug R8 - Can't execute commands if "use command options dialog" unchecked

Still trying to get used to R8 from R7:
For some reason I unchecked “use command options dialog” under “general” and could not execute any command (neither right click, space key or return key work when unchecked), took me a while to figure out that it was linked to “use command options dialog”, same with both latest release candidate including today.