same here - slow start but there is some growth now on courgettes (Cavilli, Soleil, Defender) olden Hubbard has several fruits about 6 inch in diameter, various winter squash are starting to fruit but everything seems so slow. The Atlantic Giant pumpkin won't be much of a giant :(
On a positive note, I have a couple of water melons in the greenhouse, the biggest is about 5 inch in diameter 8)