Keynote 6 won't undo or SAVE after certain actions!
So, since I upgraded to Keynote 6 my presentations are driving me insane.
After I do certain actions (like editing points made with the Draw with Pen tool), at some point (I never notice exactly when) Keynote stops responding to some vital commands like Undo or Save. It's weird, because (for example) if I used ⌘+Z , the "Edit" menu would turn blue, with nothing really happening at all. What's even worse, is that the Quit command (⌘+Q) will stop working as well, which frustrates me a lot, because, as I can't save my presentation, all the hard work I put into it after this "specific action" will be lost when I try to force quit.
I tried using my keyboard and the menu buttons to activate each of these actions, with no success.
Is there any way to fix this error? Is Apple aware of this bug? Is there any way to recover the work I made after having this problem?
Keynote version: 6.6.1
Macbook Pro (13-inch, Late 2011)-OTHER, OS X Yosemite (10.10.5), Memory: 8 GB 1333 MHz DDR3