A popup stating "CIDFont+F1 cannot be created or found" when opening a document.
This is a font format designed for languages with vast character sets, such as Chinese, Japanese, and Korean (CJK), or for complex font embedding in PDFs. Instead of mapping a character directly to a keyboard stroke, it uses an index number (a Character Identifier) to locate the correct visual shape (glyph). cidfont f1 normal fixed
is another common source for this placeholder. A popup stating "CIDFont+F1 cannot be created or