I have gotten the memory allocation error during batch renders on C6P on a Mac.  It seems that there's a memory leak somewhere in the program.  We've reported it as a bug, but haven't heard anything back.

Memory leaks, I'm told, are among the hardest sorts of things to track down.

As for the other errors in your posting, I haven't had them, but how annoying!  "An error has occurred."  That's helpful.  At least give some kind of code so I can make some kind of reference!

Though I have no helpful solutions to offer, you have my sympathy.

:D