Dimension stops rendering

I'm running Dimension CC 3.0 and in the last few days I'm having troubles with the rendering of certain simple scenes with three to four objects. The rendering phase often stops at 49% or 50% and won't progress at all for more than 15 minutes then I have to abort, usually it's always under 5 mins. I never had this problem but it appears the latest update might have caused these problems. How can I fix this?