For some reason, a file in my one of my projects is not providing highlighting or warning. In the status column on the right of the editing Pane the top box is grey and provides hover help of "Analysis is switched off". Other files seem to display this and highlight just fine.
I tried turing off Solution wide analysis and flushing cache but nothing seems to get this file back under analysis. I noticed some OLD reports of similar problems but haven't been able to resolve them under 4.5.2.