0.51 issue with screen refresh and loss of control after delete ID7.pcd

[Rotoslider]

Problem with 0.51. None of the trees are colored or shown anymore. All pcd files vanish from the screen after Automatic tree segmentation. They are still in the list on the left and I have to change color then zoom in or out to get it to show on the screen. Any change made on the left will not show in the main window until I zoom in or out. This seems to cause the screen to refresh and the changes are then update. Previous version did not have this problem.
After I deleted two of the pcd files on the left I no longer have mouse control of the point cloud. I can no longer pan or rotate etc. All I can do is draw a box which does nothing.
I have yet to be able to save a project. There is no save button period. If I click file/ close project then try to reopen later it fails with empty job files or it just crashes and closes. Had the same problem with previous version. Looking at the 3df file it seems sometimes it gets corrupted.
This time I tried to open a project I was working on for a couple hours and it could not find the terrain and veg files which are in the folder.
If I hit abort it loaded all files but the terrain and veg. The rotate and pan etc are working again and now bounding boxes show up around some trees. Thats new.
This was first time I was able to load a previous project. It only lost two of the files terrain and Veg. It also did not save tree position or any of the info to attribute table like DBH height etc.

Windows 10