In one document, I changed a section of type to Helvetica, then it turned pink. It says Helvetica is missing. I opened another document and used Helvetica with no problem. I closed InDesign, checked my fonts and used Helvetica in other programs. Reopeing ID, I copied the Helvetica type from the second file and pasted it in the first file, and now Helvetica works fine in the first file. What the heck?
@OP
Are you sure you really have that Helvetica installed & activated in your system? If you use InDesign CS5 or 5.5 and you have received documents as packages where used fonts have been stored in Document Fonts folder, you may use those fonts in indd-file that has been stored in the same root with Document Fonts folder. If you move your indd out of that root, certain fonts may stop working....
I dont know if this causes your troubles, it´s more likely font management issue but still worth to check if nothing else helps you out.
Of the top of my head, I have four Helvetica's installed, not all with the same attributes available. (Roman, Bold, Heavy, Black, 55, 65, 75, 95) If you were able to change a chunk of type to Helvetica, you would have done that from the character panel. If it turned pink, than there was a character style applied before the change which is not available in that particular Helvetica.
In my perspective , the document in which the helvetica font is coming pink is created by someone else and hasn't been craeted by you.
If this is right then most propabably the font type that is installed on your system is not the same that has been used in the file.
the best option would be to get the package from the person who has created this file which will have all the font
I created the file a few years ago on a different computer with an older version of ID. But as far as I know, the file didn't even contain Helvetica before I changed some text yesterday. That's when the pink showed up. I guess it's possible that some small corner of the page had some Helvetica text left over from that old computer.
North America
Europe, Middle East and Africa
Asia Pacific