Help opens a blank page

Fl does not open the help in dev

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Trying to open the help using shortcut key F1 In the development environement . When I press F1 a blank page is opening.

AX 2009 SP1.

Do you have the help files installed?
technet.microsoft.com/…/hh314109(v=ax.50).aspx
www.microsoft.com/…/details.aspx

Title changed from “Dynamics AX 2009” to “Help opens a blank page”.

The help files are installed.

Help files are installed. Checked with them twice.

The error is

Addresee: Kerndoc://functions/char2num

Sys documentation --functions-- char 2num…

I have tried it with different solutions, Anybodys help appreciated.