a few days ago i received a drawing, after opening it, my mouse middle button setting has gone to mbuttonpan=0
the problem is now this setting is set as a default now, and every time i open ACAD i have to reset it to mbuttonpan=1

Any way to solve this ?

Plus, now every time i close ACAD i find a file (acad.lsp) which comes out from no where into the directory of the working files i open. what should be done to stop this.

Those issues are really driving me crazy and wasting my time. Thanks for your help