This could be nothing to worry about. Sometimes the filament gets snagged on the entrance to the Teflon spacer and won't go all the way in. Then of course the motor can push as hard as it likes but the plastic isn't melted, and it ain't goin nowhere. I try to put a point on my filament rather than square cut it.
If that's not the whole story then tweaking the temperature up by 10C might help too.
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nightwish 0
Congrats to your UM2, fine machine
Is the blue and red filament from same brand? If not it could be that the red one is indeed a more tricky one..
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