Negative Zoom Start Value in PCB View

[NickInTimeFilms]

Current Behaviour

Some files load in with a negative zoom value on the PCB view, but display correctly zoomed and centered. Using the mouse or trackpad to scroll zoom causes the value to jump to 1 along with the view matching 1%.

After value is set to a positive number, the rest of the file session is fine. Just annoying to have to manually scroll zoom in the first time at start-up. This does not affect all my files, but those that do reliably trigger this negative start bug every file open.

I've tested back several versions, and the bug does not appear in 1.0.0. 1.0.3 and above have the bug.

I've looked through a bunch of files and it's hard to spot an exact pattern, but larger boards over 50mm and boards with components off the board seem more likely to have this issue.

Saving As a problem file in 1.0.8 does not change the issue.

Getting the absolute of the start value would probably work as the number seem right, it's just negative.

Build:
Version 1.0.8
(CD-2903-0-5aa56a510 2026-07-28) Cocoa [Qt 6.8.3]

Operating System:
macOS 12.7.6 Monterey

Steps to reproduce:

• Step 1: Open file with issue
• Step 2: Go to PCB View and negative zoom value is shown
• Step 3: Scroll and value is reset to 1, then regular scrolling after that.

Expected Behaviour

Zoom value is positive, scrolling correctly adds or subtracts from the current view.

[firuzakhmad]

Hi @NickInTimeFilms, I would like to try to dig into this. Would you be able to share one of the files that triggers the negative zoom on open, if you have one? Thank you!

[NickInTimeFilms]

Hi @NickInTimeFilms, I would like to try to dig into this. Would you be able to share one of the files that triggers the negative zoom on open, if you have one? Thank you!

Negative Zoom Bug.fzz.zip

Very interesting. I found an old file and slowly started stripping away parts and the bug has remained all the way down to a completely blank pcb. The file currently starts at -440% zoom for me on the pcb screen.

Things I tried removing:

• Components with red bounding boxes for missing connections
• Parts that were hanging over the pcb boundry
• All PCB components from Schematic view
• All wires from Breadboard view
• Adjusting PCB Size from decimal to whole numbers

Hope this helps.

[firuzakhmad]

Thank you so much for testing that and sharing the file! Oh with extra tests that you have done it rules out a lot of possibilities and points more toward something in the base file or PCB size handling.
I'll pull this into a debug build and start tracing where the zoom value gets set on load. Will update here once I find something, and thank you once again!