I was using the 'Flat' theme, but recently bought and started using the 'Flatplus' theme. But now, any custom css entries will not take effect. It's very strange. Using JEvents v3.4.57, and flatplus34_3.4.15.zip.
Any ideas what i can do? I'm stuck on Joomla 3.10.x so not willing to go higher than JEvents v3.4.57