Avast stuck at 99%?

Every time I run a full system scan, it stops at 99% and the timer just continues, anyone know why? When I run a boot-scan I dot get it to finish as a comparison.

Can you verify which is the last scanned file?
If you set the report level to “ok” files, the one which is correctly scanned will be a the end of (a long) report. The next one will be the “problematic” one.

…/CHS_boot.ttf

Sorry it is a real weird file extension but microsoft in there somewhere.

Seems to be a font (TrueType Font). Hope some of the programmers could help to guess what is wrong while scanning it.