Thanks HCP and sorry for not covering all my bases in the OP.

The address is in my addresses tab under receiving (but balance shows 0). Console confirms this.
Green dot, connected to 10 nodes and synced.
Fully up to date.

Edit: when I rightclick the address in electrum and click "view on blockexplorer" it shows up with 0,5 btc balance, but still not in electrum itself..