IDE Changed?

Is it me or has the IDE changed over the weekend? Tabs no longer work the same way. The Tab key didn’t work at all to start with. I went to the settings menu and updated it to 4 (had always been 4 in the past and I’d never had need to alter this). Pressing the Delete key while on the LHS of an (unselected) line of code has the bizarre effect of erasing the entire line.

IDE behaviour seems to have righted itself overnight.