Strike-Thru feature disappeared after installng an update

[mikestuto]

I just downloaded an update to the PICO PDF EDITOR -- i did this from within the software's "HELP" menu. I clicked on "Check for Updated Version".  Once indtalled, I opened the software to edit a document and the "T" with a line-thru- it Icon that was gone.  The other choices (a B for bolding text and an I for Italicizing text) were still there but no more Strike-Thru.  That is one the main features I use this software for.  Please help