When launching MathType, either by itself or from within another application, users sometimes receive the following error message…
…despite having successfully installed MathType và even used it previously without receiving an error. Pressing the OK button will allow MathType to lớn run, but a number of important characters will be replaced by empty boxes in equations.
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The original version of MT Extra, which is still distributed with many word processing, publishing, và test generation programs, contains only 43 characters:
When MathType is launched, it checks the version of the installed copy of MT Extra extra. If an older version is installed, the expected characters will be replaced by empty boxes.
To understand this problem, it is important to understand how Windows and macOS handle fonts in their Fonts folders. In Windows, if multiple files exist for the same font, only one will be displayed in the Fonts Control Panel. Windows may be using an older version of MT Extra, even though the newer version has been properly installed. On the Mac, if Word happens lớn install all of its fonts into the per-user fonts thư mục for some reason (maybe an Office reinstallation, etc.), MathType may not find the newer/correct version of MT Extra and the above warning will appear. MathType for Mac does menu the path to the older MT Extra file, which is helpful as it could be in any of several places.
If you reinstall or upgrade your word processor, manually install the equation editor that comes with your word processor, install a new program that contains an equation editor, apply a service release or patch or update to your word processor, or use the "Detect & Repair" feature that comes with Microsoft Office, very often these installers will overwrite the version of MT Extra that comes with MathType, resulting in an error message when launching MathType because the newer, enhanced version of MT Extra has been replaced with an older version.
The simplest way to lớn address this problem is to lớn reinstall MathType. If you downloaded MathType and no longer have the installer, you can tải về another copy from our Downloads page, but please make sure to download the version you are licensed for. If you are licensed for MathType 6.9, and you tải về MathType 7.4, your sản phẩm key will not work.
If you are familiar with the Fonts Control Panel & the use of Windows Explorer, or the various font locations in macOS, you could manually install the MathType version of MT Extra after removing extra copies of MT Extra from your system per the instructions below.
You can manually install MT Extra, but you should first remove all the copies already installed on your computer.
Windows 8 and later
It's best khổng lồ have only 1 copy of a font on your system. In the latest versions of Windows, deleting a fonts isn't impossible, but doing so is more trouble than necessary. Simply open a file Explorer window, navigate to lớn C:Program FilesMathTypeFontsTrueType
Windows versions up to lớn Windows 7, 32-bit
Note: Because only one copy of MT Extra will be shown in the Fonts Control Panel at a time, you must refresh your fonts menu after deleting each copy of it so that if another copy of MT Extra is in your fonts folder, it will appear. It may be necessary khổng lồ delete và refresh your các mục a number of times to lớn delete all copies of MT Extra. If another copy of MT Extra appears in your fonts list, the actual file name for the phông will be different.
Choose Control Panel from the Start menu.
Look for the MT Extra font and delete it.
Close the window & repeat the first 3 steps. (It's not sufficient to press F5 khổng lồ refresh your danh sách of fonts. Doing so won't reveal any additional copies of MT Extra that are present.)
From the tệp tin menu of the Fonts Control Panel, choose "Install new font". There is a copy of the enhanced version of MT Extra in MathTypeFontsTrueType. NOTE: The tệp tin you want is mtextra.ttf (the "ttf" may not be showing on your computer, but the "mtextra" will be). Do not be misled by the similarly-named phông "Mt Extra Tiger.ttf". Reinstalling that one won't help.
MT Extra should be installed into your Fonts thư mục and you should no longer receive an error message when launching MathType.
Windows 7 64-bit
Locate the phông MT Extra. NOTE: The tệp tin you want is mtextra.ttf (the "ttf" may not be showing on your computer, but the "mtextra" will be). Vày not be misled by the similarly-named font "Mt Extra Tiger.ttf". Reinstalling that one won't help.
MT Extra should be installed into your Fonts folder and you should no longer receive an error message when launching MathType.
From the Applications thư mục open font Book.
Look through the list of fonts for MT Extra. If it exists, remove or disable it.
From the tệp tin menu choose add Fonts.
In a Finder window, navigate lớn ApplicationsMathType 6FontsTrueType and double click MT Extra. NOTE: The tệp tin you want is mtextra.ttf (the "ttf" may not be showing on your computer, but the "mtextra" will be). Vì chưng not be misled by the similarly-named fonts "Mt Extra Tiger.ttf". Reinstalling that one won't help.
Since the enhanced MT Extra is now in your macOS Fonts folder you should no longer receive an error message when launching MathType.
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We hope this has been helpful. As always, please let us know if you have questions about this, or if you have additional techniques that work. We'd love to lớn hear from you.