Update - Coradine have put their Facebook page back up - and the comments are worth reading!
There is a good tip amongst the comments - if you have LTP6 safeguard all your data now by exporting it all to txt files using the inbuilt export function. I doubt it is possible on a Mac - but some are saying there is a risk Coradine might block the export function once they realise how many people are planning to move to mmcLogbook (who are working on a Mac version). I've got all my data exported and backed up in case they try anything sneaky!