I am unable to open worlds on a new budget-brand tablet running MCPE 13.0 and Android 4.4.4 - it's a Spidotech Sleek W1:

http://spidotech.com/tablet.html

What I expected to happen was...:
A new or existing world should be loaded.

What actually happened was...:
The error '"<World Name>" can't be opened' is seen every time, even though the world is created on the SD card.

Steps to Reproduce:
1. Tap 'Play'
2. Tap 'New World' or any existing world
2a. Configure the new world as desired
3. The world begins to load, and the error is encountered

Additional info:
I tried removing all of these created worlds and replacing with a known good world from a working Android tablet, but this one wouldn't open either. All other running apps have been closed. OS is up-to-date.

Please let me know what other information I can provide - I did check that the spec of this tablet meets the minimum spec for MCPE, so I don't think hat should be an issue here.

I have an identical tablet which I will try to reproduce the problem on this evening, which should at least suggest whether or not it is device-related.