We use EO.pdf 18.0.70.0 in our product.

Recently we have noticed an anomaly reproducible under the following conditions:

1. HTML contains text "tt" (i.e. two consecutive "t" characters).
2. Our application generates PDF.
3. We open PDF using either Adobe Acrobat Reader or MS Word and inspect "tt" fragment.

What we see is:

1. In MS Word we see single character instead of "tt", appearing as space.
2. In Adobe Acrobat Reader "tt" appears fine, however if one copy-pastes it into Notepad, it gets pasted as non-printable character appearing as square.

Here is the fragment of HTML file containing "tt":

<div class="printout">Watts engine</div>

After PDF is rendered and "tt" is copy-pasted from Adobe Acrobat Reader into Notepad it appears as:

Wa􀂂s

Please advise. I have actual HTML and PDF files demonstrating the problem but they are rather large and I don't see a way to attach them to my post.

Thanks in advance.

This is indeed related to the font we use.

Thanks for the suggestion; we'll look into using a different one.