Thanks for the suggestion Wapperdude.
I ran thru these to no avail. I cannot delete the created tab, for instance, since this would del my drawing.
i'm on a network, so backup, virus checking, encryption, etc are being looked into also.
It 'feels' like the files i'm editing exists in memory only. then when i perform the Save, it then Opens it for the writes. It's at this time that I believe it cannot open it a second time because some other process has its hands in it. Then the errors pop up.
Thanks!