FM - Strange Font Appearing in Filemaker

One of my employees/customers gets a strange font in Filemaker if they close it out and then reopen it.  The only way they can clear up this problem is to reboot their whole PC.  We've scanned their PC for viruses and malware with no luck.  Any ideas?
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Will LovingPresident, Dedication Technologies, Inc.Commented:
I have seen this happen a number of times. Somehow one of the default system fonts gets corrupted, deleted or disabled and FM tries to substitute in the correct font. In the past, this has been traced to Verdana Regular and Arial Regular being missing from the fonts (check the system's fonts directory).  The other variations such as Bold, Italic and BoldItalic were present just not Regular.

Two solutions have worked: 1) copying Verdana Regular and Arial Regular from another working computer, 2) creating a new user account on the same machine.

In rare cases, the issue only occurs on one layout, in which case rebuilding the layout has fixed the issue.

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rvfowler2Author Commented:
Thanks.  Copied over the Verdana and Arial fonts from another computer and that solved the problem.
Will LovingPresident, Dedication Technologies, Inc.Commented:
I'm just a "font" of esoteric knowledge...
rvfowler2Author Commented:
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