Revit 2026 – Type Properties / Instance Parameters not updating correctly

[red72TKB]

Hi all,

Since updating to Revit 2026, I’ve run into an issue where parameter edits don’t “stick” if I change two values in the same dialog.

Example 1 (Type Properties):

• Open Type Properties of a family.

• Edit Parameter A → saves correctly.

• Edit Parameter B → reverts back to old value after hitting OK or Apply.

Example 2 (Structural Beam Offsets):

• Select a beam.

• Edit the Start Level Offset → value updates correctly.

• Then edit the End Level Offset → the new value does not stick. It reverts, and I have to re-enter it for it to apply.

Notes:

• This only occurs in Revit 2026.

• Tested on both type and instance parameters.

• Behaviour is normal in 2025 and earlier versions.

Is this happening to anyone else in Revit 2026? Is this a known bug, or is there a workaround apart from re-entering or clicking Apply after each parameter change?

This is annoying me enough that I'm about to install Archicad because they also do Vector Shadows.

[blank...]

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@red72TKB wrote:

Is this happening to anyone else in Revit 2026?

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No, can't confirm, works OK.

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This is annoying me enough that I'm about to install Archicad because they also do Vector Shadows.

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If you do, could you come back after 3 months of using Archicad and share your experience.

[red72TKB]

Thanks for your help.

[TripleM-Dev.net]

Maybe something with the family or constraints, or focus of mouse shifts, read some posts about 3D space mouse (drivers) causing wrong input place or not sending a mouse click correctly.

Try it with one of the stock doors or a wall changing type / instance parameters.