@Dammit
When you say 'down' do you mean into a higher or lower gear?
Assuming mechanical?
Does pulling the cable (at the downtube say) without the shifter change properly?
If it's not going into higher gears, it's not releasing cable so something is sticking - either shifter or the cable.
Down the block, into a higher gear. Cable is hanging slack, jockey wheel in correct position below highest gear, chain won’t release second highest gear sprocket.
@hippy started
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@Dammit
When you say 'down' do you mean into a higher or lower gear?
Assuming mechanical?
Does pulling the cable (at the downtube say) without the shifter change properly?
If it's not going into higher gears, it's not releasing cable so something is sticking - either shifter or the cable.