I just copied in a schematic from a V5.Xx version
Simple 7803 regulator circuit. I use the +3V3 power symbol to connect the various net together.
But on my ATTINY when I placed this 3V3 symbol and connected to the Vdd I get an erc error , input pin has no output , ( not the exact )
This usually crops up where an input power pin has no obvious input power source
But. A 3v3 power symbol actually get used in both cases ie marking the output of the regulator and elsewhere in the schematic the input to various other nets
I fixed it by placing a power flag. It it’s not great
This erc didn’t appear in V5