The way JavaScript is loaded into the footer has changed., While we had a small hack in there to try and deal with the mis-use of Bootstrap and it’s negative effect on jQuery Ui components – the script change means that in some cases it may well be loading the fix a little too early., This results in BootStrap winning precedence and an error being shown in the console.
@mr-papa and I are discussing it to see of we can sort out a replacement ‘hack’ and will try and address tgis ASAP. Trouble is he will not be here for a few hours and i am about to leave for the airport to go away for a few days. Hopefully however, we can do something quickly,
The real bottom line is, however, that this not actually a forum bug. Bit we should be able to help fix it.