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I've just tried to reproduce the error using the same font image and settings, but have been unable to do it.  5 days ago, the issue was consistently happening for me using the offline and online versions.  I see that Chrome has updated itself since then...  In the meantime, I was able to get around the issue by using an older offline version. 

Hello. I'm seeing the exact same issue (same error message) with the new version. I have the previous downloadable version and it works fine for the same image and settings. Using up to date Chrome.