Thanks for responding on a Saturday, Michael. I really appreciate it.

No special punctuation. Files created within an open file, using Save As, disappear after being renamed and changes are made. I open files that are mult-Mb large and only the file name appears in MOI; no content appears.

The only difference or change, as I noted, was the upgrading of 4 apps after using MOI in April.

It took some doing, but I came up with a work around this afternoon: with the file open, I selected all and exported as 3dms to another computer. I got my model updated...whew!

We are issuing Monday and will get back to this issue thereafter. I need my MOI!

Any other thoughts you have are welcomed.

Thanks again,

Leonard