Is Zixzax standing by the statue, or one of the portals, encouraging you to enter? Did you do so, get a conversation with Astarte or the demon (depending on the room) and then return to the main area by the portal (rather than using Rift Travel to exit the End of Time)? In some cases, you need to return to the main section of the homestead with a main character in the lead; for the Hall of Heroes, for example, that is required to get a dialogue triggered, which is needed to completely open that portal.
Check the last portal opened. When a portal is completely open it will be marked on the map, so if there is a portal active without a marker, it means you didn't enter and get the encounter, or there was an issue with the encounter.
If the homestead is under attack, then it is by design that no portals are opening. You need to stop the fireballs raining down (doing something in the northern part of Luculla). Talk to Zixzax and check your quest log.
If old saves, or new ones made in a new game, will load properly, but recent saves will not, then the problem is likely something in the save itself. Are the saves that crash associated with particular map areas? Did you start to have any crashes when trading with particular NPCs or in particular maps? If so, there will be a fix for that (and another crash issue that can occur after reaching Luculla, but you are past that point) in a patch to be released early next year.
Please email supportdos@larian.com, with a description of the problem (or link to your post) and a couple saves (or a Dropbox or Google drive link, etc). You would first need to transfer them to a USB flash drive to get them onto a computer: in the Saved Data in System Storage section of the Settings menu, click Copy to USB Storage Device, select the relevant save and Copy. Include your latest save, and maybe the oldest that won't load and most recent that does.
