Yeeeeeaaaaaahhh!!!! Looks like adding "int" in front of the webstorage has got my game working again.
I've no idea why it used to work without the 'int' and now I need to include it to make things run. My game's been working the same way perfectly for some time and I have apps on the android market running that way with no problem.
Many, many thanks for helping me get this sorted, Kyatric, and apologies for the mess I made of my earlier capx example (not sure why I used a value of '1' as an example - all the initial values on my main game are '0', and I don't have the unwanted speech marks in the main game either).
Really appreciate you getting to the bottom of this <img src="smileys/smiley20.gif" border="0" align="middle" />