I had similar problems as well and have now gone back to 5.5.094.000, no more problems.
But I have also noticed on the Forum that with the latest version of ZA these problems have been sorted. I am still (at the moment) loath to try it again though.
If you want to go back I still have the 5.5 version download as a zip file on my computer. I can email it to you but it is about 7mb.