Recently when I go to import a stl file into STL Importer I get the message "File is invalid or corrupted". This is happening to about half of the STL files that I have, many of them I have imported before with no problem. I can open the files in Meshlab with no problem and with making no adjustments to them just save as a stl file then STL Importer works as it should. Does anyone have a clue as to what is happening?