I have a Samsung Galaxy Tab2 10.1 P5110 and Dropbox App was on there when purchased. I've also put Dropbox on a Desktop and Laptop and they both sync perfectly, but I can't get the Tablet to do the same. Looking at 'Settings' on the Tablet my email address is ....gmail.co.uk. and is greyed out and cannot be changed, but on all other accounts it is ...gmail.com. Any ideas on this please?