no selection in edit mesh shown in cam/perspective viewport

[max montana]

hi, since 1 week i face the problem, that by doing edit mesh i get no red highlight of the selected polygons in the cam/perspective viewport. in the orthogonal viewports i see the selected polys highlighted red, as they should be.worked before perfect for mounths, has someone faced this problem before?
thx

[RErender]

You think this is a V-Ray problem?

This should be posted in Take 5...

[max montana]

you´re right - sorry for that, would be nice to get a suggestion anyway.

[dbibb]

F2 is the default shortcut to toggle 'shade selected faces'. Did you hit that by accident?

[max montana]

that`s what happened...thanks dbibb