Mids Help!
Right next to "Name: ______" there is a button that says "Dynamic" or "Level Up". Try clicking that.
Paragon Wiki: http://www.paragonwiki.com
City Info Terminal: http://cit.cohtitan.com
Mids Hero Designer: http://www.cohplanner.com
Also, make sure that the button next to "Dynamic" reads "Power/Slot" rather than "Power Only".
I was not even aware of that button (or at least not aware that it had any function) until I fired up Mids' out of curiousity to see if I could recreate your problem. It seems to turn off the placing of slots and it's setting survives New/Clear and closing and restarting Mids.

In Paragon City since June 2005.
Thanks Feefa! That worked perfectly!
No idea why that button needs to exist if not to catch out noobs like me lol.
I don't know how I have managed to do this but I have completely broken Mids...
I can no longer place enhancement slots. When I load one of my characters, I can remove enhancement slots but never replace them anywhere even in a level 1 power or even the power I just took them from. When I start a new build, I can choose as mnay powers as i like but I can't enhance them beyond the starting slot each power is entitled to.
Anyone know what I have done to cause this and how I can fix it?
Mids is a big deal for me, I am pretty sure I enjoy playing on Mids more than I do coh.