I am reporting that the saves are *not* fully compatible. I was able to transfer the Windows saves to Linux and play without any problems, but when copying the Linux saves back to Windows there are behaviours which prevent playing. Although the Linux saves seem to load correctly, I have experienced the following:
1. No dialogue possible with any character - plot cannot advance as a result. Cannot buy/sell goods or talk to anyone
2. Clicking on doors, chests, tomes, etc. opens the inventory screen instead - no doors can be opened
3. Creatures do not respond to the party - combat has only party actions and no enemy actions, as they just sit there not moving.
I'm submitting this to the linux developer list.
I will test android compatibility when possible, but I have not yet loaded the game there.
Regards