I don't know about anyone else, but I despise the word 'glitch'. It makes a bug sound like it only happened once.
You glitch a radio by running a microwave oven next to it. The radio's failure to work correctly is not the radio designer's fault.
I similarly don't like the word "bug". Bug implies it wasn't always there, that it just got in somehow, snuck in through the cracks.
I try to always use the word defect.