Building the Lighting in 4.2 freezes my pc for a while

When I build (with high quality lightmaps for sure) the scene is exported but then the pc completely froze. It took 15 minutes to unfreeze and then it started building the lighting.
I’m using the default lightmass setting and the area covered by the importance volume is not complex or big.
World to meters is set to 100.

I have an i5 4440 and a 750 ti gtx plus 8gb ddr3

Have you experienced the same issue? I don’t know if it’s a begginer problem or not.

Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes.
If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, please submit a new report for it.
Thank you.