Hello,
You have tried to leave and relaunch Dynamo and/or Revit
cordially
Christian.stan
Yes, a couple of times. but it no success.
Hello @londonZ7F92 could be an addin issue try to disable your addin and see it could help…btw do you have speckle installed ?
yes i have speckle installed
Allright thats prbably why…there are some problem with speckle…they work on a fix for that but in the meanwhile you can disable speckle addin and should work hoppefully 
for disable you could use Diroots app manager as is free…hope it could help
Wow, Thank you. I left the speckle add-in in Dynamo, but removed in Revit. yes it working now.
But I couldn’t understand, I have two devices, only on my PC was the problem. on my laptop the speckle didnt clash with dynamo
Yeah hope we soon find a real fix for that
Hi @londonZ7F92 …seems they have fix it now if you update to 2.13 from speckle manager it should work at least for me