Thanks for the feedback DustedAsh3!
I have encountered the first of those issues you describe. For me, the issue is that the memory runs out when using the 32 bit version with a 44.1k sampling rate or higher.
There is a log file generated that can be viewed by selecting File -> Show Log File. Usually, there is some hint to be found in that file, such as an error message or stack trace.
It would be very helpful if you could send me the content of the log file after you manage to trigger any of the bugs you encounter. It would also be great to get the template file you used (with .wbte extension) and the intermediate song/sfx format (with .wbrt extension) and what version you use (32 or 64 bit, free or full version).
Even more info can sometimes be found if you turn on all the first three options in File -> Settings -> Debug, but if the render fails like you describe, it is likely that some of that information is missing.
Now that I write this stuff down, I realize that all this could be handled with a bug report feature that I should add to the application :)
Again, thanks a lot for the feedback!