DaVinci Resolve 15 Beta 6 - Edit

It's happened in previous beta's as well.
If I use F9 (or the associated button' to insert a clip at the'timeline cursor' it now inserts at the beginning of the timeline when earlier in the project development it did it correctly.
It seems to me that adding new features is all well and good, but, more testing needs to be on the basics of video editing before releasing a beta.
i'm having issues in 'rendering' MP4 videos; which in some cases just basically exits the application (no warning), or hangs the application (have to kill with the task manager), or it results in me sending a requested 'report' of what I was doing at the time.
My timelines are not complicated with very basic transistions and simpleSLog2 colourv grading.
I'm beginning to think my machine is inadequately configured (hardware).
I7-8700K, GTX 1070, 32GB (am upgrading to 64GB)
If I use F9 (or the associated button' to insert a clip at the'timeline cursor' it now inserts at the beginning of the timeline when earlier in the project development it did it correctly.
It seems to me that adding new features is all well and good, but, more testing needs to be on the basics of video editing before releasing a beta.
i'm having issues in 'rendering' MP4 videos; which in some cases just basically exits the application (no warning), or hangs the application (have to kill with the task manager), or it results in me sending a requested 'report' of what I was doing at the time.
My timelines are not complicated with very basic transistions and simpleSLog2 colourv grading.
I'm beginning to think my machine is inadequately configured (hardware).
I7-8700K, GTX 1070, 32GB (am upgrading to 64GB)