Problems in select with left button

Hi,

im using 2.56.0 r34074, i was working in a house, and everything was fine till now, i always used left button to select and in some models i can select with it. when i press the left button i cant select anything, ans appears in left pannel a option “Trackball”, if i maintain pressed the button apears a cross, and i cant select anything.

But if i change the select button to right i can select again as before, if i open a new file with objects, selecting with left button, everything works fine.

In other layer everything works fine! in the same file!! how can i fix that? here is the file to understand what im saying.

mediafire.com/?bkltk2g2gdlolgd

Thanks for the help

Press X to delete the object you currently have selected.

hummmmm ok… but if the object is complicated to re-create? in the file i have a large amout of objects with that problem, i really have to delete all?

No, just the one that is selected when you open the blend file you attached. Open the blend, immediately press X and delete. I believe from memory it is Mesh.022