- Version 4.5.1 (discovered while using Ark: Survival Evolved modified Dev Kit).
- Installed UE4.5.1 (non-Ark version) and did reproduce it.
- To recreate, I created a new blank project using Engine Version 4.5.1 from Unreal Engine > Library, went into StarterContent folder, opened Blueprint_WallSconce and created below Event Graph using OnClicked event from static mesh component SM_Lamp_Wall (event itself is irrelevant to actual issue, but was used as a start point).
Recreation:
- Created below graph (variables Test 1 and Test 2 can have any random string inserted):
- Change t2 to input2 in the “Format” field without detaching strings (notice: string is detached automatically on rename but previous “from” node is still solid):
- Reattach original “from” node to input2 and compile:
In step 2 of process, node originally connected to t2 is still solid, as if it’s leading to something. If you Alt+click on this to clear it, error in step 3 is prevented. If you do not Alt+Click on it before reconnecting it to now renamed input2, error is encountered upon compiling blueprint.