We have end users experiencing this issue with the letters scrambling. They must reboot to fix. Happens many times throughout the work week.
there's a known issue with Acrobat Reader DC as the cause of this.
Re: Acrobat DC isn't playing nicely
Are you aware of any patches for this Adobe <-> FileMaker Pro font scribbling issue yet?
I am, I did, and I forgot it at all
First when this appears, quit Adobe Acrobat Reader DC, then restart your FM Solution.
I know you had a work around at hand. Can't find it in the "Jive-Jungle".
Can you help?
Rather than pointing to other Community posts, please see Knowledge Base Article #15419:
Some fonts are replaced with an unreadable .tmp font | FileMaker
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