I've first lost intellisense in VS for NinjaTrader.Custom project, and since restarting VS (closing it and starting VS from NinjaScript Editor) didn't help I did what I always do in that circumstances - Rebuilt the solution in VS. This caused 2 files previously included in the project (one indicator and one common classes) to be omitted. After adding them manually the solution could be rebuilt and I had Intellisense back in VS.
EDIT: After writing this I realized the reason why I lost intellisense was that the files had been excluded from the solution in the first place! So ALL the files I have been working on (which had changes made to them since opening of Visual Studio) have been excluded from the Custom project after reload.
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