FS#1286Canvas flickers/flashes white when scrolling.
- Type
- Bug
- Status
- Closed
- Resolution
- Not a bug
- Category
- QCAD (main)
- Severity
- High
- Priority
- Low
- Reported version
- 3.11.3
- Operating system
- macOS (All)
- Reported
- 2015-10-27 by adthrawn
- Closed
- 2016-02-02 by andrew
When scrolling quickly, the entire canvas flashes white (some kind of video buffer issue?). This includes the rulers, but excludes the scroll bars and the corner fillet at the top-left between the two rulers. Frequency of flicker is linked to speed too - the more you scroll the fast the flicker.
I've marked the severity high - obviously this is not a functional problem, but the strobe effect is causing headaches and may have negative affects for people with illnesses triggered by flashing light. Even with the background set to white, the flashing is still severe - when the background is set to black, it's unbearable.
Using a Mac Pro (10.10.3) with AMD FirePro D300 2048 MB graphics and dual displays. Happens on either of the displays. Was using an August 2013 build with the issue - just upgraded to latest build and have same issue. Didn't experience this on previous/older Mac Pro (running 10.8), so suspect it's an issue with hardware or OS version?
Closure comment
Problem was solved outside of the scope of QCAD.
Comments (3)
There are currently no known problems with Mac OS 10.10. I don't have an Apple system with an external display here for testing, so that might be a potential issue.
You might want to test the new 64bit package for Mac OS X which is based on newer libraries, to see if the problem persists.
Since the the original report, I upgraded to El Capitan and tried 3.11.3 before replacing it with the new version, and it seems to work. It would appear it was an issue with 10.10 (maybe 10.9 too), but has been fixed with 10.11. Worth noting that the new version works on 10.11 without issues, in addition to 3.11.3.