You managed to change the tool overlay setting. Bottom left of the screen, in the nomal display setup for the Develop module. Change it back to "Always" (probaly switched to "Never") and you'll see your familar circles again.
Perfect, thanks loads. Its always simple when you know how!
I use an Asus Phone pad which is basically a Nexus 7 but branded differently.
I use it to view and store images and to take them home rather than taking the camera memory cards themselves and for that it works really well. I stuck a small memory card into the tablet and transfer the images from the camera card to that to give a little breathing room on the tablets own memory. I started with NMM but now find the file manager utility that came with the tablet just a useful.
I have not done any image manipulation on the tablet and tbf prob will never bother.
For a simple easy way to view images and store them in the short term, this setup works really well and has a lot to commend it. I paid £180 for the tablet and another £20 in apps and leads.