I am seeing the same problem with the "Check HTML code" option always disabled. 
I just installed this (version 4.5.9) on a new Windows 7 system.  Never had a
problem with version 4.5.4 which I used on a different Windows 7 PC (both
64-bit).  Highlighter in the status bar is "HTML multihighligher".  The file
"C:\Program Files (x86)\PSPad editor\TiDy.exe" exists.  I have tried opening
several HTML files that worked fine with the older version of PSPad, and they
all show "Check HTML Code" grayed out.  This is a feature I use all the time, so
I think I will have to revert to the older version.

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