not possible to overwrite existing images

i use acronis true image 2011

its full with new features what i dont need

somehow it is not possible anymore to overwrite an existing image even i configured "one Version"

true image 2011 always tried to create generations ... with brackets in its name....

if i want to overwrite the existing file 1.tib
i get a 1(1).tib instead and of course the 1.tib still exists

that means i always have to delete 1.tib first to get a new 1.tib

quite annoying

any ideas on this

thanks ray, switzerland