Hi All, i am running ACAD Arch 2015 on Windows 7 64bit and have the SP2 installed and running ok. Whilst using a beginners tutorial book and creating the learning project i have found that the drawing files in the Project Navigator are 'locked' and no editing is possible, the whole layout becomes highlighted when i try to pick an object. This is apparent when i copy rooms etc to a new level and then try to delete some of the walls to create a new layout. Does anyone know of a fix or perhaps a way to unlock these files to enable proper editing.

BTW, i did find a temporary fix by saving the files to another location like the desktop but this didn't last for long and i am back to the original problem.

Any help or suggestions would be most welcome, thanks in advance.