However then I started to experience a few problems - for a while I was unable to log in and make withdrawals. This was resolved but it put me off investing anything other than very small amounts.
Thinking of giving it a go again - can anyone verify that it is still working reliably, i.e users are reliably able to make withdrawals, and payouts on investment are working as they should?
You are not the first individual to have issues with this site. I don't know why you are replying in this thread because there is one which is more current and has much more replies its located at
https://bitcointalksearch.org/topic/satoshidicecom-the-worlds-most-popular-bitcoin-game-77870
Apparently there are many issues with the site, especially the hot wallet which is almost always empty and lately the site seems offline more than online.
At the moment would be best not to make any new deposits and wait patiently for the hot wallet to refill so you can make your withdraw.