Tools error in model builder

[Briande_Vogel1]

When I try to edit my model all the tools are turned white with only two of the four borders drawn. 

I also can't select the tools anymore, see picture below. Anyone knows how to fix this?

[DanPatterson_Retired]

details like arcmap version etc would help rule out issues already seen

[Briande_Vogel1]

Ah sorry! I am using Arcmap 10.4.1.

[DanPatterson_Retired]

I can't find any specific bugs, but I would be concerned it occurred in all models and/or the view persisted after a save, a reboot and a reopen of the model

[MichaelVolz]

Did you have this model working in an earlier version of ArcMap?  If so, do you have the ability to still run the model there?

[Briande_Vogel1 · Accepted solution]

Thanks for looking in

It only happens in this model, I tried the save/reboot/reopen of the model and also saved it under a different name. None of it helped though.

I solved it by ctrl-a the whole model and pasted it into a new blank model and everything works fine again.

[DanPatterson_Retired]

one of the great modelbuilder mysteries... I will add it to my list of recommendations