I cannot paste in ravendb management studio

I cannot paste in ravendb management studio

i have installed ravendb 22330 build. now i m trying to patch my db collection. for that i m trying copy a JScript code from a text file and paste in in ravendb studio patch textbox but i cannot paste it over there. no warning and error ms is displayed. even i cannot copy any thing from document editor and paste it some where else in the system.

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