My C3D 2013 just started doing this last week... I first noticed that it would zoom to extents when I operated the center mouse button for panning. It was random, about 1 out of every 15 to 20 pans using the center button. Someone suggested I get a new mouse. Still did it.
But then I noticed that it's not just the panning. It will randomly zoom to extents when I type in a command. Earlier today, it did it when I did a REGEN, then again when I did a MAPWSPACE.
The other notable thing is that there is no "zoom" command anywhere in the command history when this occurs.
Besides changing the mice, I also tried rebooting and running a repair on C3D. I have Win7-64.
The problem seems to coincide with when I started using Autodesk 360. Not saying it's related, but it's fishy.
Double clicking center mouse button has always invoked zoom extents for me. It does that to me too when I get to panning too quickly. Not sure if there is a setting for it though?
Yes, that's why I thought it was the mouse at first. I use the double click mbutton all the time and I haven't changed my technique. But it will do this even after typing in a command.
BTW: you can disable the double center click zoom-to-extents by setting mbuttonpan=0. But that also disables the center button pan function, which I can't live without.
Just to follow up...
In my earlier post, I mentioned this problem seemed to coincide with when I started using AutoDesk 360.
I know this makes absolutely no sense, but I discontinued using AutoDesk 360 and disabled the cloud sync. I have not had the random zoom-to-extents issue since. Go figure!
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