I and I understand many others have problems with the latest version too. I tried to add a blurring effect to a small clip this morning and PD crashed. When I switched off some of the hardware encoding in the preferences it went a bit better. Maybe that is something you can try too.
further,opengehaald freezing ignition have to do with the shadow files that either should have been created to ease the preview, or of which the collection best can be deleted to start with a new empty folder.
since it is the playback only (I guess that the clip plays alright after production??) maybe the preview quality settings should be lowered a bit?