Mmmmm, weird. This is either a partial clog that incidentally happened at the same time you've switch to 4.8, or an error when importing the profile. Check the filament size, because it looks like you have 2.85 instead of 1.75 in the machine settings. If you still have 4.7 installed try to print something small sliced with 4.7, the typical x,y,z cube for instance. If it prints ok, it's the filament size in 4.8. If it prints all wrong, clog
Or who knows