I tried to use Telescopius this evening to find an emission nebula. I was told that none were found given my filter settings. I cleared the filter and reselected emission nebula. Same result. I had the same response on the web site.
This seems to be a problem of a wrong cached file. Could you please try clearing your browser cache for telescopius.com and let me know how it goes?
Works now even though I didn’t do anything. 
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