I've been in contact with Vinicius by email, and have given him some of the details of the issue. I'll repeat that here, for the benefit of anyone else who may be following this thread. Also, I'm including what I believe to be the best way to solve the issue (I don't think there's really a good way that's quick, but this is the best I know). The issue is related to two things. First thing is that when you have a document created in Word for Windows, with MathType equations, and place that document into InDesign for Windows, InDesign uses a process to convert the equations into EPS, but they’re not pure EPS. They’re a combination of EPS and WMF. This isn’t the same as an EPS with a WMF preview image. It’s an EPS with also elements of WMF inside. That’s really all the information I can provide about that because I don’t fully understand it myself, but that explains why there are sometimes problems displaying these equations on a Mac – normally you can’t open a WMF on a Mac. (There are exceptions, sure, which is why I said normally.) The second component to the issue is that of fonts. An EPS file is rendered when the rendering engine interprets the instructions encoded inside the EPS. If the EPS contains text or is a MathType equation, part of those instructions will be which font to use to render the image by the computer display (or other rendering engine, such as Adobe Acrobat, etc.). Thus, it’s critical that the fonts used in the equations must accompany the document so they can be found when the document is opened on a different computer. In the case of equations, one of the most common fonts used is Symbol font, and this one is particularly problematic when going from Windows to Mac, because the fonts are different. Since Symbol font on Windows is different from Symbol font on the Mac, and also since this is the main thing causing the garbled & substituted characters in the original screen shot above, here's my workaround for that. This requires both Windows and Mac computers or virtual machines, so clearly this isn't a solution for everyone. If the equations are appearing normally on the Mac, there's no need to change anything. The only equations I changed were the ones that were incorrect (as you see above). I started with the original Word document, which I opened in Word 2016 for Windows. I double-clicked to open the equations (one at a time) in MathType. Again, no need to do this for the ones that look OK on the Mac. Without changing anything in MathType, I saved as EPS/none (that is, in EPS format with no preview image). I opened these MathType/Windows EPS equations in MathType/Mac. Without changing anything, I saved them with the same name as the original. This is necessary because InDesign already knows the size and baseline adjustment (vertical shift) for each equation. You can name them whatever you want, but if you do, you'll need to do more to position the equations in the document. After doing all of that, I updated the links in InDesign. Here's the result:
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