Sounds like my issue exactly!  Only happening on one of three computers and only in bill entry section.  I turned off the auto-fill and that seems to have worked but it's odd that some vendors still auto-fill now and some don't even with it turned off.  For now, that seems to have solved my problem but I will keep your suggesion in mind in case it happens again.  Thanks for the suggestion!  I think this is a QB glitch that they need to correct with an update.