In the last hour I've experienced more Mixcraft crashes than in all friendship since v7

All of them happened during deleting of muted tracks recorded with Messiah 2 64.
I wasn't using M1 to much, but about 2 weeks ago I've started heavily testing the Messiah 2 as I fell in love with the sound of it.
I've made some new beats and now started cleaning them of unwanted midi-tracks.
Then Mixcraft randomly crashes on some deletes, resulting in fast clipping in speakers.
Once it is possible to close Mixcraft window, once not. Despite it, clipping doesn't stop, and it is not possible to end up the related processes in task manager. The only way is to restart the pc. That's with M2 64 / MC9 PS 64 v436 / Win7Pro
I've just noticed the new build, so I'm gonna try it too...
Another M2 issue is that it only plays right until recording. After record (and sometimes during) it starts sounding flat, completely 'plain', and I have to reload the preset for my midi record to start playing fat sound again. And that cancels all my adjustments, so now I have to do it after record and reload.
Next thing concerns Nectar 2. Three or four times, when stopped the playback and came back to Mixcraft after few minutes, I've found the message window saying that problem with N2 occured and it'll turn off. The other instances and the rest of the project were working fine, and the crashed one also fine after project restart. However, the project was very simple, just the beat and four vocal tracks with N2 applied separately.
Before, that never happened with massive projects in Mixcraft 8, and I was using N2 and N2 vst3 alternately to see if any can cause the problems.
Is any of the above possibly fixed in the new build?