This has been a sporadically recurring problem during WIP/Beta developement since… I can’t remember when, at least back to Rhino 7 or maybe earlier. When one has the popup toolbar on-screen - after having called it up using a MMB press for example - with the MMB still held down, hovering over a bu…

Hi Mitch, yep - same as RH-78837 from the 8.5 fix, knocked out again by the 9 toolbar rework while the LMB flyout path still holds it. logged as RH-97067 and referenced the original as a regression. @CallumSykes can you drop the exact build you’re on (Help > About)?

[image] Japhy: can you drop the exact build you’re on (Help > About)? Latest public I think - (9.0.26195.12303, 2026-07-14)

I"m kinda confused on whats going on with the MMB popup after the latest release. I think there is a missing delay? I MMB click (down and up quickly) and where my mouse is, that command fires off. I just want to click and make the toolbar visible. [Screenshot 2026-07-22 105851]

Sorry for this RH-97126 Popup menu: vanishes when mousing out

@CallumSykes This is a huge problem for me. Where can I download the previous Beta?

[image] Helvetosaur: When one has the popup toolbar on-screen - after having called it up using a MMB press for example - with the MMB still held down, hovering over a button and releasing it should execute the button command. Would the above not effectively halve the number of commands that …

Hey @MattE , both are possible. There’s a 750ms timeout for this in 8. If you hold for >= 750ms then the pop-up dissappears and runs whatever your mouse is held over. I misunderstood this when applying some fixes in 9. It’ll be solved in next weeks build so it’ll work like you both expect. Also @Hel…

Correction it is 400ms. Next build will have the fix in, as well as allowing for the Cascade As Menu for the PopUp.

Popup toolbar mouse button release execution broken (again)

Serengeti (Rhino BETA)

brian (Brian Gillespie) July 21, 2026, 10:11pm 5

RH-97067 is fixed in Rhino BETA

[Rhino 9 Beta] MMB pop-up triggers on button release

Topic		Replies	Views
[Rhino 9 Beta] MMB pop-up triggers on button release Serengeti (Rhino BETA) windows	3	145	July 28, 2026
MMB popup toolbar broken since last service release Rhino windows	1	70	April 22, 2026
Toolbar button click on MMB release not working Rhino for Windows windows	3	517	July 3, 2023
Pop-up menu disappears immediately on Middle Mouse Button click Serengeti (Rhino BETA) windows	3	131	August 28, 2026
URGENT! Bug! MMB popup menu no longer works! Rhino for Windows windows	20	743	October 1, 2026

Popup toolbar mouse button release execution broken (again)

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