oh ok that's not good
page context is when you right-click on the page and then you you should see a menu popup 'extra services' which then opens the other menu containing the entry command for 'activate previews'
if it's not showing that can be one of 2 things..either some macro has errors and caused the menu to disappear..to check ths, restart kmeleon without browsing to any pages and open the error console(tools>error console) and click on the kmm button to display kmm errors
if no errors, check to see whether the page services speciality macro or the link preview macro are disabled( even after reinstalling they will stay disabled if they were already disabled because disabled macros are kmeleon settings)
edit>preferences> kmeleon macros
make sure both those 2 macros are checked
linkpreview.kmm
pageservices.kmm
both have to be enabled for the extension to make a menu
hope this fixes it