Thanks for your feedback concerning the mask zoom/move tool.

Can you please clarify for us something... your second finger accidentally lands/starts outside of the main image (for example in the toolbar area below main image) when attempting to zoom or move, which in effect, is like masking with one finger? 

We are currently investigating an undo button solution which will help rectify this situation. 

This has been fixed in v0.96 beta

In terms of the bottom layer being locked. Perhaps we can unlock certain features for the base layer - example swap with layer above etc. We will do a pass on this and see what we can unlock for the base layer.

Thanks for the raising this issue. We will look at this and try come up with a clearer solution.

We assume you are iOS?  On android you also have the ability to go back/exit by using the device back button.

Ok, so the bug is if an 'exclusion' or 'subtract' blend layer is top most and then saved, flattened or shared. 

A temp fix is to have the top most layer anything but 'exclusion' or 'subtract' blend - apologies! We are looking into this.

We are still investigating this issue as it is intermittent bug so hard to reproduce. If you have exact reproducible steps - let us know.

This seems to be specific to Android and we are looking into this now.

Thanks for reporting this!

Ok - good idea we'll look into only showing that dialog once - perhaps per run of the application just for reminder sakes?!

in regards to the undo/redo options this will be something we potentially add later. Obviously this would be handy ;)