Witcher 3 pre order has disappeared from my library, now i have 0 games??? I also hid all the free games i got when making my account and now there seems to be no way to get them back to show? just says 0 games nothing else?

The hiding function is buggy and you are advised not to use it.
Try clicking on the following link to refresh your account: https://secure.gog.com/en/account/refresh

If it doesn't work, you are advised to contact support by going here and selecting "game not visible on list/shelf" as the problem type.

https://www.gog.com/account/refresh. That should, hopefully, solve the problem.

Thanks.

If it worked, please mark reaver894's post as the solution. It helps others who might have the same problem and finds this thread when looking for a solution.