I am running 32bit. and for me teleporatation to the end of times only works if its a fresh load.. and to teleport back to rivelon, I need to hope either my load is still okey or I need to save the game than close the game, than open the game and load the savefile in end of times.

But just wondering, Does the following happening to you too. after playing a while, and made and want to go back a earlier savegame that it either crashes or get stuck in an infite loop on the loading page with the status "cleaning up the level"

If that is a yes, download this tool : http://www.larian.com/OriginalSinAlpha/AnalysisTool_DOS.exe
Run it in administrator mode and after running it, send the report.zip to support@larian.com